美国联邦储备委员会是如何运作的?(1)
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远程WI-FI(1)
他们的发明之一是以无线上网为基础的长途网,或者叫远程网络无线保真技术... Eric Brewer is a busy man. He is a computer science professor at the University of California, Berkeley. He is also directo...
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...
癌扩散(1)
癌细胞扩散是癌症患者最不愿意听到的,那癌细胞是如何扩散的呢?The word "metastasize" means to change form, state or position. It is not a word cancer patients want to hear. Cancer can spread in a ...