简单序列长度多态性

Editors note: This is the third episode of four-part series on verb tenses. Be sure to listen to part one and part two first. For VOA Learning English, this is Everyday Grammar. Today we are going to talk about the perfect verb tenses. Perfect tenses

发表于:2018-11-27 / 阅读(387) / 评论(0) 分类 2016年VOA慢速英语(十二)月

Section A [00:01.23]1. M: I haven't decided which subject to major in [00:04.96]physics or chemistry. [00:07.76]W: It isn't easy to choose,is it? [00:10.21]Q: What does the woman mean? [00:13.87]2. W: The map shows that this street goes downtown. [00

发表于:2018-11-29 / 阅读(157) / 评论(0) 分类 决胜四级听力必备

Section A [00:01.54]1. M: My grandpa died in 1978. I was 18 years then. [00:08.20]W: That means he would be 76 if he were alive. [00:11.49]Q: How old was his grandpa when he was dead? [00:14.45]2. M: Why are you going so fast? [00:17.53]Where are you

发表于:2018-12-01 / 阅读(180) / 评论(0) 分类 决胜六级英语听力

This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. Its the time of year to take a look backand thats just what the journal Science did as they listed their most important breakthroughs of 2008. At the v

发表于:2018-12-02 / 阅读(103) / 评论(0) 分类 Scientific American(十二)月

图片 by Jason Marshall Its not often someone suggests that knowing some math could make you the life of the party, but thats exactly what Im going to do. Yes, a properly timed delivery of a few fun facts about the famed Fibonacci sequence just migh

发表于:2018-12-07 / 阅读(110) / 评论(0) 分类 数学英语

[ti:UNIT 7 Enjoy Your Hobby Lesson 56:Unit Review] [0:01.051]Unit 7 [0:02.631]Enjoy Your Hobby [0:04.894]Lesson 56: [0:06.943]Unit Review [0:08.907]I. [0:10.231]Building Your Vocabulary [0:12.963]A. [0:14.500]Fill in each blank with the proper word o

发表于:2018-12-10 / 阅读(117) / 评论(0) 分类 河北教育初中英语(初中起点)八年级上

发表于:2018-12-12 / 阅读(55) / 评论(0) 分类 医务英语

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? The human genome was sequenced, and in the process of moving that forward the technology that was developed was incredible. And because of their efforts in human genome,

发表于:2018-12-24 / 阅读(148) / 评论(0) 分类 Scientific American(十)月

Describing Order and Sequence Patrick: Okay, your first task is to put all of these files in order. Maya: Wow, there must be hundreds of files in this storeroom. How am I supposed to organize them? Patrick: Create a basic filing system. Put things in

发表于:2018-12-27 / 阅读(100) / 评论(0) 分类 2014年ESL之商务英语

说一口流利的英语,从简单的单词开始。 听听,读读,背背,今天你的词汇量又增加了5个。 单词/词义 中英例句 单词听读 arm [ B:m ] He received a call to arms

发表于:2018-12-30 / 阅读(105) / 评论(0) 分类 每日攻克5词

图片 by Jason Marshall Some math is functional. Some math is fun. And some math is simply stunning. If that last description sounds improbable to you, then today just might change your mind. Because now that weve covered enough ground, were going t

发表于:2019-01-02 / 阅读(191) / 评论(0) 分类 数学英语

This is Scientific American's 60-Second Science. I'm Steve Mirsky, got a minute? Neandertals were our closest relatives. And now we know a lot more about them. Because researchers have for the first time sequenced a complete Neandertal genomethat of

发表于:2019-01-08 / 阅读(109) / 评论(0) 分类 Scientific American(八)月

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute? Robin Williams thought that the platypus was cobbled together by an inebriated deity: Lets take a beaver. Lets put on a ducks bill. Now we know how weird the platypus is

发表于:2019-01-08 / 阅读(104) / 评论(0) 分类 Scientific American(五)月

Up in arms At arm's length 在美国人讲话时,或从书刊报纸上,你经常可以听到或见到一些由手臂,就是英文里的arms这个字组成的成语或俗语。有些习惯用语从

发表于:2019-01-14 / 阅读(150) / 评论(0) 分类 美国习惯用语

古埃及金字塔是奴隶制帝王的陵墓,最宏大的当为吉萨三座大金字塔。塔基呈方形,每边长230米,高146米,用230余万块巨石(每块平均重达2.5吨)垒成,国王墓室用一块400吨重的石板垒成。整体规

发表于:2019-02-01 / 阅读(75) / 评论(0) 分类 阅读空间

BEIJING, Aug. 22 (Xinhuanet) -- Researchers have discovered how a human egg captures an incoming sperm for fertilization, paving the way to help couples suffering from infertility, according to media reports on Monday. An international team of resear

发表于:2019-02-08 / 阅读(112) / 评论(0) 分类 英语新闻

[00:39.12]height 高度 [00:43.33]length 长度 [00:47.42]mathematician 数学家 [00:52.35]be required to do something 被要求做某事 [00:58.34]measuring tape 卷尺 [01:04.45]A team of mathematicians were required [01:06.76]to measure the heigh

发表于:2019-02-15 / 阅读(111) / 评论(0) 分类 英语笑话(MP3+文本)

Listen to the schedule of a business trip. Fill in numbers l-8 to point out the sequence of the schedule. I'm leaving for Milan on the 7th of June. l'II arrive there on the 8th evening at about 7:OOpm. Then, l'II take a shuttle bus to the hotel. On t

发表于:2019-02-17 / 阅读(83) / 评论(0) 分类 英语听力练习题

Listen to the dialogues and write the correct sequence of l-6 as mentioned in the dialogues. A:How do I search books from the computer? B:First, key in your PIN number. Then, it goes to the Library's Homepage. Then, you can choose any way you want to

发表于:2019-02-17 / 阅读(65) / 评论(0) 分类 英语听力练习题

Thank you for being here,Fareed.Nice to have you on the show. 多谢你抽空前来 法里德 很高兴你能来上节目 Let's get started first with your background.I do think I know a lot about you. 首先聊聊你的背景 我觉得我很了解你

发表于:2019-02-23 / 阅读(74) / 评论(0) 分类 柯南脱口秀
学英语单词
2-amino-9-p-aminophenyl-acridine
adsorbed atom
aguised
airlifting
aluminium sulfocyanide
arteriographic
banespa
basic event
bertins
biogenic landforms
bizimungus
blast-furnace cement
breather-mask
brockwell
calcinite
captive fluid indicator
Chrysobalanus icaco
Ciriely
coefficient of association duties
colosseus
cups of joe
Dallin, Cyrus Earle
dangerous articles
denease
Deux-Sevres
Dhakuākhanā
divisional bonds
dropped out
eeeee
EEG automatic analyzer
enamelled slate
executive control
Eyota
fair cutting
ferrous oxide spots
flood retarding basin
formed coil
glycocholase
glyphosine
Gongylonema ingluvicola
goosetongue
graphic interpreter
harrassments
high-strength carbon fiber
hirtiflora
interosculation
keine
live polio-myelitis vaccine
local galaxy
long - term asset
lylas
magnesium alkyl compounds
malaysian dances
male karpaty(little carpathian mts.)
marine magnetometry
Mascarene Plain
metacryst inclusions
methodological nominalism
N. L. F.
nephtheid
nerve and mind war
news-herald
nondisplay
nonlinear theory
normal polar contact
on the face of things
on-stream time
optical position measurement
oscillator wavemeter
Paninihian Pt.
pelerine fabric
plasma ion
Polygonum tibeticum
pop-up defense
potamoclastic rock
primitive state
Progonat
prompt copies
pull in and side window
purpura rheumatica
Rach Gia, Vinh
resonance-level spacing
reversal test
Rhianwen
semipreparative separation
sequel
snakewhips
spinzero
storage overlay
strain selection
Sylnplocos caudata Wall.
talus succession
tax on bank-notes
tiotidine
topographic adolescsnce
track indication lamp
transosseous venography
Turpinia
voltage-feed antenna
wire installation curve
wrnt