Road traffic accident has been threatening human life and is now the first public health issue in the world.
道路交通事故严重威胁着人类的生命健康，已成为世界首位公共卫生问题。
Some controversy has surrounded the issue of face transplants, in part because face injuries are not seen as life-threatening.
围绕着换脸有相当多的争论，一部分原因是因为面部的损伤并不是致命的危险。
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