音标：[ˈekəʊˌsɪstəmz] ；

n. <生>生态系统( ecosystem的复数形式 )

n. a system formed by the interaction of a community of organisms with their physical environment

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(64) / 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(156) / 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(68) / 评论(0)

2016年Scientific American(八)月

NPR 2010-11-09

From NPR News in Washington, I'm Lakshmi Singh. A radical Sunni Muslim cleric born in the US is urging religious scholars to promote holy war against American and Israeli interests in the Middle East. NPR's Soraya Sarhaddi Nelson is in Cairo and repo

发表于:2019-01-08 / 阅读(71) / 评论(0)

2010年NPR美国国家公共电台11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(94) / 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(141) / 评论(0)

VOA标准英语2012年(一月)

VOA慢速英语20061114a

AGRICULTURE REPORT - Study Warns of Risk to Seafood Supplies in World's OceansBy Jerilyn Watson Broadcast: Tuesday, November 14, 2006 This is the VOA Special English Agriculture Report. A study has wa

发表于:2019-01-30 / 阅读(79) / 评论(0)

2006年慢速英语(十一)月

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(102) / 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(81) / 评论(0)

实用英语

加州语文教材 G3 V3 Ecosystems in Balance 11

图片1

发表于:2019-02-20 / 阅读(135) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 10

图片1

发表于:2019-02-20 / 阅读(136) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 09

图片1

发表于:2019-02-20 / 阅读(872) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 08

图片1

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 07

图片1

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 05

图片1

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 04

图片1

发表于:2019-02-20 / 阅读(138) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 03

图片1

发表于:2019-02-20 / 阅读(133) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 02

图片1

发表于:2019-02-20 / 阅读(149) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 01

图片1 图片2

发表于:2019-02-20 / 阅读(148) / 评论(0)

加州语文教材California Treasures G3

加州语文教材 G3 V3 Ecosystems in Balance 06

图片1

发表于:2019-02-20 / 阅读(132) / 评论(0)

加州语文教材California Treasures G3

最新学习文章

热门学习文章

热门标签

英语听力 VOA标准英语 VOA 英语歌曲口语听力提高听力材料听力教程英语学习 NPR 英语口语 VOA慢速英语美国国家电台儿童英语 VOA英语小学英语 cnn VOA常速英语标准英语英文歌曲听电影学英语英语单词英文电影慢速英语 CRI 美联社新闻美国有线新闻加州分级澳洲新闻流行歌曲常速英语 ABC新闻快递疯狂英语英语读物听力棚车少年经济学人英语词汇商务英语 VOA双语新闻 BBC 中国电台大学英语 Treasures 加州语文 BBC英语英语听力网站 VOA英语教学词汇万花筒 SSS VOA英语听力 AP 新概念分级英语英语广播听力精选英语播客英文绘本 TED演讲赖世雄英语MP3 CCTV9英语新闻 lesson 英语新闻初中英语学英语英语语法历史上的今天英文广播剧英语游戏原版英语小说英语有声读物书虫英语牛津英语读物访谈录新闻一分钟考研英语英语每日在线听新闻 Us 新概念英语地道英语单词第二册自然百科高中英语 sports 实用英语 MP3听力辛沛沛 ESL英语第一册英语每日一句 unit 新东方 GRE 每日一词 BBC听力

学英语单词

aesthesioneuroblastoma