工程师说钚可能会开始从遭腐蚀的潜艇往外渗透。Engineers said that plutonium could begin seeping from the corroded sub.危险的辐射物从钚放散出来.Dangerous emissions radiate from plutonium.钚也可以用来制成核武器.The plutonium also could be used, however, to make nuclear...
In social politics, too, the city's contribution to 20th century thought and culture was no less portentous...同样从社会政治学上看，城市对20世纪思想、文化的贡献也意义重大。Before me stretched the portentous, menacing road of a new decade.在我面前展现出...