[生态] 生态系统力能学

Decrease in Shark Population Harms Ocean 1)Ecosystems

Broadcast: Jan 16, 2003 Experts say one of the world's most feared, but misunderstood, creatures is under 2) assault by fishermen. A new study of all types of sharks finds that there are fewer of them

发表于:2018-12-08 / 阅读(56) / 评论(0)

VOA2003（上）-科技先知

VOA标准英语2012--Report: Ecosystems More Stressed Than Ever

Report: Ecosystems More Stressed Than Ever When Super Storm Sandy ravaged the U.S. East Coast and inundated New York City in late October, many wondered if such extreme weather events might be linked to climate change, the gradual warming of the plan

发表于:2018-12-08 / 阅读(150) / 评论(0)

VOA标准英语2012年(十二月)

科学美国人60秒 SSS Waste Amphetamines Alter Underwater Ecosystems

Last week, tens of thousands of gallons of sewage gushed into urban streams in Baltimore, because of leaky pipes and flooding rains. And when that happens, it's not just organic matter and microbes that get flushed into aquatic habitats. It's drug re

发表于:2018-12-24 / 阅读(60) / 评论(0)

2016年Scientific American(八)月

Lonely bug

Lonely bug NB: This is not an accurate word-for-word transcript Dima:Hello and welcome to this edition of 6 Minute English with me, Dima Kostenko Rebecca: and me, Rebecca Byrne. Dima:Today we'll have some useful words and phrases used in science and

发表于:2019-01-10 / 阅读(85) / 评论(0)

六分钟英语

Severe Drought, Wildfires Threaten Water Resources

Severe Drought, Wildfires Threaten Water Resources This is Valles Caldera. Actually, it's the giant mouth of a dormant super volcano that last erupted 40,000 years ago. In the millennia since then, the terrain developed high-elevation forests, of abu

发表于:2019-01-13 / 阅读(136) / 评论(0)

VOA标准英语2012年(一月)

TED演讲:为什么油水不能混合(1)

Why does salt dissolve in water but oil doesn't? 为什么盐可溶于水而油却不行呢？ Well, in a word,chemistry. But that's not very satisfied, isn't it? 总的来说，是化学作用。但这并不令人满意，对吧？ Well, the reason

发表于:2019-01-17 / 阅读(53) / 评论(0)

TED演讲教育篇

俄科学家研制出"不老药"

俄罗斯莫斯科的一位生物能量学教授近日宣布，他已研制出一种能够有效延缓衰老的不老药，并有望于几年内上架销售。这位科学家用40年的时间研制出一种抗氧化剂，能够有效抑制氧分子对人

发表于:2019-02-06 / 阅读(120) / 评论(0)

阅读空间

雅思范文：学童用功

Topic: In some countries, parents expect children to spend long time studying both in and after school, and have less free time. Task: (You may spend 40 minutes on this task, and write a minimum of 250 words) Do you think it has the positive or negat

发表于:2019-02-09 / 阅读(93) / 评论(0)

雅思英语

GRE试题一(1)

SECTION 1 Time - 30 minutes 38 Questions Directions: Each sentence below has one or two blanks, each blank indicating that something has been omitted. Beneath the sentence are five lettered words or s

发表于:2019-02-13 / 阅读(73) / 评论(0)

实用英语

加州语文教材 G3 V3 Ecosystems in Balance 11

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发表于:2019-02-20 / 阅读(130) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 10

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发表于:2019-02-20 / 阅读(132) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 09

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发表于:2019-02-20 / 阅读(865) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 08

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发表于:2019-02-20 / 阅读(130) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 07

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发表于:2019-02-20 / 阅读(121) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 05

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发表于:2019-02-20 / 阅读(119) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 04

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发表于:2019-02-20 / 阅读(128) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 03

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发表于:2019-02-20 / 阅读(124) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 02

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发表于:2019-02-20 / 阅读(139) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 01

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发表于:2019-02-20 / 阅读(137) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 06

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发表于:2019-02-20 / 阅读(122) / 评论(0)

加州语文教材California Treasures G3

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