标签：oxygen 相关文章
What Causes Altitude Sickness? Anyone who has vacationed in the higher elevations of Colorado, such as Vail and Estes Park, will tell you altitude sickness can be a real problem. Loss of appetite, nausea, vomiting, weakness, dizziness, and difficulty
英语听力文摘 English Digest
EXPLORATIONS - Blue Holes: Some of the Least Explored Areas on Earth BARBARA KLEIN: Im Barbara Klein. STEVE EMBER: And Im Steve Ember with EXPLORATIONS in VOA Special English. A blue hole is a flooded sea cave with a hole that opens up at the lands s
2011年VOA慢速英语(十一)月
Hubble Detects Oxygen-Bearing Minerals on Moon 哈勃天文台探测到月球上拥有含氧矿物质 The orbiting Hubble observatory is usually aimed at extremely distant areas of the universe. But f
VOA2005（下）--环境科学探索
[00:00.00]Module 4 [00:03.29]Unit 2 [00:06.64]Head,shoulders,knees and toes. [00:11.91]Activty 1 [00:15.36]Sing and do the actions. [00:24.82]Head and shoulders Knees and toes Knees and toes [00:36.18]Head and shoulders Knees and toes knees and toes
新标准小学英语活动用书第2册(一年级起点)
[00:00.00]Revision module BListening and speaking [00:05.00]14 Listen and number the words in the order you hear them. [00:46.63]15 Listen again and answer the questions. [01:26.87]Words and expressionsRevision module B [01:32.18]play with 和一起玩
新标准初中英语第二册
Anyone who has vacationed in the higher elevations of Colorado, such as Vail and Estes Park, will tell you altitude sickness can be a real problem. Loss of appetite, nausea, vomiting, weakness, dizziness, and difficulty sleeping can plague those visi
2018年NPR美国国家公共电台2月
Voice 1 Welcome to Spotlight. Im Nick Page. Voice 2 And Im Liz Waid. Spotlight uses a special English method of broadcasting. It is easier for people to understand no matter where in the world they live. Voice 1 Yawning. It is something that people e
环球英语 Spotlight
April 14 is Plant Appreciation Day (PAD). This is when you appreciate just how important plants are to us. Few of us ever stop to think just how vital plants are to our survival. Without them, we wouldnt be here. Plants change the CO2 in the air into
世界节假日博览
[00:00.00] Module 10 [00:08.10]Unit 1 [00:13.06]Exercise 1 [00:19.02]Listen and repeat. [00:23.28]a clinic [00:28.81]a stomachache [00:34.87]a headache [00:40.65]feel sick [00:46.50]Exercise 2 [00:55.14]Listen to the questions. [00:58.51]Then read an
新标准小学英语第七册（三年级起点）
[00:00.00] Module 10 [00:08.10]Unit 1 [00:13.06]Exercise 1 [00:19.02]Listen and repeat. [00:23.28]a clinic [00:28.81]a stomachache [00:34.87]a headache [00:40.65]feel sick [00:46.50]Exercise 2 [00:55.14]Listen to the questions. [00:58.51]Then read an
新标准小学英语第七册（三年级起点）
[00:00.00] Module 3 [00:09.40]Unit 1 [00:14.76]Exercise 1 [00:20.90]Listen and repeat. [00:25.36]grandparents [00:32.63]wedding day [00:41.17]old [00:49.14]young [00:56.79]short [01:05.25]long [01:13.01]Exercise 3 [01:23.25]Listen and check your answ
新标准小学英语第七册（三年级起点）
April 14 is Plant Appreciation Day (PAD). This is when you appreciate just how important plants are to us. Few of us ever stop to think just how vital plants are to our survival. Without them, we wouldnt be here. Plants change the CO2 in the air into
英语课程学习计划和讲义
What Causes A Lump In Your Throat? Oftentimes when we cry, we feel a lump in the throat. Does a lump actually form, or is there some other explanation? 图片1 Explanation The lump-like thing we feel when overcome by emotion has to do with how the ne
英语听力文摘 English Digest
As scientists delve deeper beneath the oceans surface, they find bizarre creatures that have adapted to harsh and extreme environments. Now comes a new onethe discovery of the first multicellular animals that survive and reproduce entirely without ox
60秒科学
Todd: OK, Michael, you are into spear fishing! Michael: Yes, I enjoy going spear fishing Todd: OK. Can you talk about that a bit? Michael: Yeah, sure. Spear fishing basically is a sport that you dive under the water with the aid of flippers, wet suit
原版英语对话1000个
VOICE ONE: This is SCIENCE IN THE NEWS in VOA Special English. I'm Bob Doughty. VOICE TWO: And I'm Faith Lapidus. Summer is a busy time for travel. Today, we discuss ideas about how to stay healthy on a long trip. VOICE ONE: For years, people have w
VOA慢速英语2009年（七）月
And how, you may reasonably wonder, can scientists know what oxygen levels were like hundreds of millions of years ago? 你也许有理由想知道，科学家们怎么会知道几亿年以前的氧气浓度？ The answer lies in a slightly obscure b
万物简史
Hello, everyone. Today is April 13th. And on this day in 1743,Thomas Jefferson, future president and drafter of Declaration of Independence, was born. The top political theorist in early America, Jefferson played an enormous role in shaping early Ame
历史上的今天-2012年
Evidence of the first oxygen in the atmosphere. The gas was released by a humble microscopic living organism called cyanobacteria. Well it turns out cyanobacteria are the only things that can actually produce oxygen, so we know that at some point cya
探索与发现2014年