全球市场再次暴跌 (1)
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- 人力资源管理师
迅捷的外星人
该音频是讲述有爱因斯坦的相对论引出的外星人飞碟速度的问题。We received a letter from one of our readers with a question about Einstein’s Theory of Relativity: Since time slows down the closer you...
谨防假药的危害(1)
假冒药品的危害 Hints: Nigeria Bangladesh acetaminophen Nigeria glycerin The World Health Organization Latin America W.H.O.Counterfeit medicines are a widespread problem in developing countries. ...
洛杉矶的博物馆(1)
洛杉矶博物馆的历史见证这座城市的发展The Los Angeles Police Museum is housed in an old station house, and it tells the story of a lawless western town that slowly developed into a modern city. Los...
天然染料(1)
自古以来人们就开始使用天然染料。这些是自然的,无公害的,绿色的染料Dye can bring a little color to life. Most clothing is colored with dyes. Modern, manufactured dyes can be costly. Natural dyes f...