cave n. hole in side of a hill or under the ground 洞穴;窑洞
Many years ago men lived in caves. 很久以前,人过着穴居生活。
pollution n. the state of being polluted污染
People in big cities have to fight a battle against different kinds of pollution.
大城市的居民不得不与各种各样的污染斗争。
carbon n.[u] a chemical element (symbol C)碳(化学符号C)
This black substance is carbon. 这种黑色物质是碳。
dioxide n.二氧化物
carbon dioxide 二氧化碳
breath n.[u] air that you take in and send out through the nose and mouth 呼吸;气息
He drew a deep breath. 他深深地呼吸了一口气。
limit v. allow only a certain amount, number, sort, etc. 限制;限定
All speeches were limited to 10. 所有发言一律限定十分钟。
n. the most that is allowed 极限;限度
There is a limit to everything. 一切事物均有限度。
sincerely adv. in a sincere manner 真诚地;诚恳地
I sincerely hope you will soon recover. 我真诚地盼望你不久就会恢复健康。
Egypt n. country in NE Africa 埃及
There are over 80 pyramids in Egypt. 在埃及80多座金字塔
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