When I was your age, a girl would never ask a boy out on a date.
当我像你这么大的时候,从来没有女孩子主动约会男孩子的。
Precautions of this sort are necessary, for it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
作出这样的准备是必要的,因为无法预见到洞穴探险者究竟会遇到什么性质的困难。