My son is my son till he has got him a wife, but my daughter is my daughter all the days of her life. 儿子婚前是儿子,女儿终生是女儿。 Nature is the true law. 天行有常,不为尧存,不为桀亡。 Necessity is the mother of invention. 需要是发明的动力。 Never fish in trouble water. 不...