[化] 烷基季铵盐

Hello to you, I'm Creshon Saunders at the CNN.com Newsroom in Atlanta. Here is a look at what's happening NOW IN THE NOWS. Israel is pounding Gaza with airstrikes for a second day in a row. Hamas militants are the target and Israeli Prime Minister E

发表于:2018-12-05 / 阅读(107) / 评论(0) 分类 CNN2008年(十二)月

Millions of gallons of fresh water evaporate from the ocean daily, leaving all their salts behind, 每天有几百万加仑淡水从海洋蒸发,留下了全部盐分, so logically the seas ought to grow more salty with the passing years, but the

发表于:2018-12-07 / 阅读(117) / 评论(0) 分类 万物简史

Water Cycle 水循环 All the oceans on earth are salty, while inland water is typically fresh. How does water become salty? We'll answer a listener's question -- today on Earth and Sky. DB: This is Earth and Sky. We recently visited the Austin Childr

发表于:2018-12-07 / 阅读(165) / 评论(0) 分类 (科普英语)Earth and Sky

In business, Optus has called for Telstra's proposals on its participation in the national broadband network to be blocked. Optus' chief executive Paul O'Sullivan says Telstra's current plan for the separation of its retail and wholesale arms wholesa

发表于:2018-12-11 / 阅读(132) / 评论(0) 分类 澳洲ABC新闻快递2011年

This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Life requires balance. We balance work and family. We eat a balanced breakfast, sometimes. And we balance our electrolytes. That salt-water synergy is no

发表于:2018-12-24 / 阅读(141) / 评论(0) 分类 Scientific American(九)月

M: Please do excuse me for a moment. I've got diarrhea. W: It's easy to get loose bowels in summer. M: It may have something to do with the food I had last night W: Youve got to be careful on the food you eat. M: I will. Thank you.

发表于:2018-12-26 / 阅读(85) / 评论(0) 分类 想聊就聊

Its easy and relaxing to make and use bath salts at home 在家里制作并使用浴盐很容易也让人非常放松 1/3 cup baking soda 1/3 cup Epsom salts 1/3 cup sea salt 10 drops lavender essential oil 1/3 杯发酵粉 1/3 杯泻盐 1/3 滴薰衣草

发表于:2019-01-08 / 阅读(142) / 评论(0) 分类 英语小短文

Synthetic Drug Problematic for US Authorities Augusta County, Virginia, is a rural county in the Blue Ridge Mountains, two and a half hours southwest of Washington. It has a big problem. Sheriff Randy Fisher says Augusta County was once known as the

发表于:2019-01-13 / 阅读(209) / 评论(0) 分类 VOA标准英语2012年(六月)

I don't feel well. I have a fever. I have a cold. I have a headache. My eyes are very itchy. I have trouble breathing. I have a stomachache. I have loose bowels. My hand was scalded by boiling water. My ankle is twisted.

发表于:2019-01-21 / 阅读(95) / 评论(0) 分类 英语口语900句

This week on Why Tell Me Why, we are finding out why the oceans are so salty. So the oceans are salty because the oceans have been around, lets say, for over five hundred million years. And over the course of time what we found out is that weve alway

发表于:2019-01-22 / 阅读(138) / 评论(0) 分类 自然百科2009年

The nineteenth century held one last great surprise for chemists. It began in 1896 when Henri Becquerel in Paris carelessly left a packet of uranium salts on a wrapped photographic plate in a drawer. When he took theplate out some time later, he was

发表于:2019-01-29 / 阅读(171) / 评论(0) 分类 万物简史

Because the British were the most active in the early years, British names are predominant in the geological lexicon. Devonian is of course from the English county of Devon. Cambrian comes from the Roman name for Wales, while Ordovician and Silurian

发表于:2019-01-29 / 阅读(124) / 评论(0) 分类 万物简史

AGRICULTURE REPORT – March 12, 2002: Carbon Dioxide and Crops By George Grow This is the VOA Special English AGRICULTURE REPORT. Increasing levels of carbon dioxide gas in Earth’s atmosphere have

发表于:2019-01-30 / 阅读(161) / 评论(0) 分类 农业与发展

What's more, I've detected those falling and rising currents that make up the ocean's true breathing. 此外,我又注意过那些由上而下和由下而上的水流,形成真正的海洋呼吸作用。 I've seen a molecule of salt water heat up

发表于:2019-02-25 / 阅读(107) / 评论(0) 分类 《海底两万里》中英双语有声读物

Water is so vital to us that it is easy to overlook that all but the smallest fraction of the water on Earth is poisonous to us, 水对我们太重要了,因此我们不容易注意到,地球上绝大部分的水对我们来说都是有毒的,

发表于:2019-02-25 / 阅读(114) / 评论(0) 分类 万物简史

迷你对话 A: When you went to the dormitory this morning, had your roommates came like a dose of salts? 你今早去宿舍的时候,你的室友已经来了吗? B: Not yet. All my roommates came like a dose of salts. 还没有,但是我的室友

发表于:2019-03-05 / 阅读(224) / 评论(0) 分类 迷你对话学地道口语
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