The sky over the city was overspread with a heavy smog.城市上空罩上了一层烟雾.Cars cause pollution, both smog and acid rain.汽车造成的污染既有烟雾也有酸雨。The river appeared as if enveloped in smog.那条河好像笼罩在烟雾之中。attempts to reduce smog caused by t...
Relativity does not contradict the older mechanics but generalizes it.相对论并不与较老的力学相矛盾,而是使之推广.One usually generalizes a conclusion from a collection of facts.人们通常从大量的事实中概括出结论.This paper generalizes Hooke � � s law in frequ...