单词：have all the hallmarks of
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This is Scientific American 60 second Science, I am Sophie Bushwick, Got a minute? Sharing is one of the hallmarks of human behavior: give me a cookie and Im more likely to give you one later. But our bonobo cousins have an odd variation on the pract
发表于:2018-12-24 / 阅读(46) / 评论(0)
Scientific American(一)月
Scientific American(一)月
The State Department says the attack on the U.S. embassy in the Yemeni capital, Sanaa, was apparently an attempt by terrorists to breach the walls of the heavily-guarded facility. Officials say the attack bore all the hallmarks of an al-Qaida operat
发表于:2019-02-07 / 阅读(36) / 评论(0)
VOA标准英语2008年（九月）
VOA标准英语2008年（九月）