Londons underground transit system, known as The London Underground or The Tube, started running in 1863. Its iconic symbol, a patriotically colored bar-and-circle roundel, was first plastered on the citys subterranean w
一月中旬,伦敦的空气质量10年来首次达标。而以前,首都的二氧化氮(NO2)限量都超标。市长很乐观,环保人士则说还有很多工作要做。Londons air quality is within legal limits in mid-January for the first time in 10 years, City Ha
导读:科学家发现了五种已知的致死性埃博拉病毒所共有的一个隐藏弱点,并成功地利用两种抗体来封锁其入侵人体细胞的能力。LONDONScientists have found a hidden weak spot shared by all five known types of the deadly Ebola virus and
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