An electric razor that meets the European Union's safety standards must be approved by American testers before it can be sold in the United States,

一把符合欧洲联盟安全标准的电动剃须刀必须得到美国检测人员的认可，方可在美国市场上销售；

with their fellow scientists either in other countries or in universities,

和其他国家、其他大学同行们

If we glimpse the unutterable, it is unwise to try to utter it, nor should we seek to invest with significance that which we cannot grasp.

如果我瞥见了只可意会不可言传的事物，企图把它说出来，那上不明智的；对于我们不理解的事物，我们也不应该去赋予它某种意义。

that a series of deep soundings was obtained in the Atlantic and the first samples were collected by dredging the bottom.

才在大西洋测得一个个海水深度，同时通过挖掘海底，取得了研究海底的首批样品。

But a closer study of the evidence, supported by a deeper sense of the period,

但是，进一步仔细研究，对那个时代的深化了解，

tap water that is too hot to touch can be left to cool and is generally safe to drink.

水管中流出的烫手的水可以留下来冷却。这种水一般是安全的。