1. For it is impossible to foretell the exact nature of the difficulties which will confront the pot-holer.
    因为无法预见到洞穴探险者究竟会遇到什么性质的困难。

2. We have made old women invisible so that we do not have to confront our society's myths about what makes life valuable or dying painful.
    我们使老年妇女退出社会，销声匿迹，这样我们就不用面对这个社会里关于何以使生命如此宝贵，死亡如此痛苦的问题了。