Precautions of this sort are necessary, FOR it is impossible to FORetell the exact nature of the difficulties which will confront the pot-holer.
做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。
Precautions of this sort are necessary, FOR it is impossible to FORetell the exact nature of the difficulties which will confront the pot-holer.
做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。
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