[医] 原始外胚层, 胚盘外胚层

primitive ectoderm的用法和样例：

例句

The remaining larger cells become columnar cells, the primitive ectoderm formation of embryos.其余较大的细胞就变成柱状细胞，形成胚胎的原始外胚层。

WHISPERS FROM ABOVE

The story of how we have systematically observed the heavens begins in the days before recorded time. For primitive man, the sun reigned supreme. Its recurring cycles of light and darkness formed the

发表于:2018-11-28 / 阅读(171) / 评论(0)

疯狂英语2001年

决胜六级听力必备 mode16

Section A [00:02.90]1. M: We've got 34 on the list so far [00:08.75]but I'm sure it'll be up in the forties before we finish. [00:13.90]W: Well,in that case a sit-down dinner is out of the question. [00:19.15]It'll have to be a buffet. [00:22.80]Q: W

发表于:2018-12-01 / 阅读(157) / 评论(0)

决胜六级英语听力

神秘的月球第3期

The full moon triggers a frenzy of activity. 满月会引发一连串狂乱的事件 It is the time of the highest tides. 海水在此时达到满潮 And in the oceans the full moon's bright light 在海中，满月明亮的胧光 is a mating call fo

发表于:2018-12-07 / 阅读(75) / 评论(0)

2013年VOA慢速英语(三)月

北师大版高中英语模块11--Unit33(3)-4

[00:01.48]This is because the subiect [00:03.53]is mentally condidering whether [00:05.29]to tell the truth,part of the truth, [00:07.47]or a complete lie. [00:09.56]Latencies of two or three seconds [00:11.84]should be regarded as highly suspicious.

发表于:2018-12-17 / 阅读(187) / 评论(0)

北师大版高中英语模块11(选修)

英语四级听力考试练习题Model Test Nine

[00:00.00]1.W:Do you have a calculator that you could lend me for a few days? [00:06.11]I just have no idea where mine is. [00:10.27]M:Well,yes,I have one.But actually my sister is using it now. [00:16.33]Q:What do we learn from this conversation? [0

发表于:2018-12-30 / 阅读(82) / 评论(0)

英语四级听力练习集锦

神秘的月球第18期

The moon mission is open to the public, 月球任务是对大众开放的 meaning anyone who has the financial capability 任何人只要能负担一亿元的机位费用 to afford the price of the seat, 就可以参加 they're each priced at a hundr

发表于:2019-01-02 / 阅读(104) / 评论(0)

神秘的月球

讨论猴子

Finn: Hello, Im Finn. This is 6 Minute English and Im joined this week by Neil. Hello Neil. (Monkey sounds) Finn: Err, Neil? (Monkey sounds) Finn: Neil, are you OK? (Monkey sounds) Finn: Actually that wasn't Neil, you'll be glad to know, he is safe a

发表于:2019-01-07 / 阅读(97) / 评论(0)

六分钟英语

CNN 2010-01-13

SAVIDGE (voice-over): Darkness falls in St. Louis and with it, the temperature. UNIDENTIFIED FEMALE: Blowing snow as well, the wind chill index five below downtown at the arch. SAVIDGE: And at the New Life Evangelistic Shelter the homeless have begun

发表于:2019-01-08 / 阅读(257) / 评论(0)

CNN2010年(一)月

西双版纳的英文介绍

Xishuangbanna is the southernmost prefecture of Yunnan Province. The prefecture is nicknamed Aerial Garden for its luxuriant and multi-layered primitive woods and tropical rain forests, which are teeming with animals and plants. Renowned as a huge na

发表于:2019-01-08 / 阅读(74) / 评论(0)

旅游英语

英语四级考试语法复习精选专项习题(1)

1.The Bushmen are _______ hunters even though their weapons are primitive. A.favourite B.original C.sufficient D.expert 2.Before he left the White House, the president made a _______ speech. A. quarrel B.symbol C.automobile D.farewell 3.The local gov

发表于:2019-01-08 / 阅读(67) / 评论(0)

大学四六级阅读

北师大版高中英语模块10--Unit30(4)-1

[00:00.00]Unit 30 [00:06.27]Task:who will go on Shipwrecked? [00:10.50]1 Read about a new TV programme [00:14.45]called Shipwrecked! [00:16.90]Shipwrecked!will be a major new TV series [00:19.77]featuring six volinteers(plus any children they [00:23.

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北师大版高中英语模块10(选修)

You’ll Never Regret it

Time is running out for my friend. While we are sitting at lunch she casually mentions she and her husband are thinking of starting a family. We're taking a survey,she says, half-joking. Do you think I should have a baby? It will change your life, I

发表于:2019-02-04 / 阅读(107) / 评论(0)

阅读空间

美国俚语:go primitive 打电话而不愿发短信

如果嫌要发短信的内容长，不方便交流，费时费力，你建议对方打电话，可以说Let's go primitive。primitive的意思是原始的，go primitive就是采用原始的方式，显然电话比短信出现的早，相比之下就

发表于:2019-02-09 / 阅读(70) / 评论(0)

美国俚语

PBS高端访谈:关于ISIS视频中人质的命运

HARI SREENIVASAN, PBS NEWSHOUR WEEKEND ANCHOR: After days of negotiations for a prisoner exchange apparently broke down, ISIS today reportedly executed a Japanese journalist it had been holding hostage in Syria. Just last weekend, ISIS also beheaded

发表于:2019-02-17 / 阅读(76) / 评论(0)

PBS访谈社会系列

英语美文：You'll never regret it 母爱的真谛

我想向朋友形容自己看到孩子学会击球时的喜悦之情。我想让她留意宝宝第一次触摸狗的绒毛时的捧腹大笑。朋友的表情让我意识到自己已经是热泪盈眶。你永远不会后悔，我最后说，然后紧

发表于:2019-02-18 / 阅读(43) / 评论(0)

英语美文

你有权保持沉默

Your cell phone is ringing. Your inbox is overflowing. Your friend wants to discuss her son's glue-sniffing habit. Martha Beck has news for youyou don't have to Be There for all people all the time. Just follow her escape routes. 手机铃声响个不停

发表于:2019-02-18 / 阅读(58) / 评论(0)

实用英语

No Gym. No Problem

No Gym. No Problem Maybe its too expensive. Maybe youre too shy. Some people just plain do not like the gym. It can be boring, intimidating, and it can seem somewhat redundant. The good news is theres another way. Sports! Here well take a look at wha

发表于:2019-02-18 / 阅读(82) / 评论(0)

阅读空间

怎样避免职场白痴地发脾气

Scream at the boss? Snap at a colleague? Throw your cell phone into your computer monitor? 朝老板大喊大叫？对同事厉声斥责？把手机砸在电脑显示器上？ In most cases anger isn't an illness but a normal human emotion that cause

发表于:2019-02-21 / 阅读(118) / 评论(0)

求职英语

月亮和六便士第四十七章(7)

One night Captain Nichols and Strickland were sitting in one of the bars of the Rue Bouterie. 一天晚上，尼柯尔斯船长和思特里克兰德正坐在布特里路的一家酒吧间里。 The Rue Bouterie is a narrow street of one-storeyed hous

发表于:2019-02-21 / 阅读(85) / 评论(0)

月亮和六便士

英语六级作文 Teacher's Day

1.向老师致以节日祝贺 2.从一件难忘的事回忆老师的教诲和无私奉献 3.我如何回报老师的关爱 It is Teacher's Day today. On this special occasion I would like to extend my heartfelt congratulations to all teachers, Happy

发表于:2019-03-11 / 阅读(185) / 评论(0)

四六级写作指导

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bipolar processor