There are accasions when (on which) one must cry.这句话怎么翻译

There are accasions when (on which) one must cry. 这句话怎么翻译 英语翻译这句话怎么翻译啊?People must understand that there are objective There are many pens on the desk,which one is there are pccasions when one must give in .为什么用when there is one point____we must insist on. 我用WHICH ONE 去申请签证?这句话怎么翻译 If you want to see the ruins , you must go on foot .这句话怎么翻译, 英语翻译翻译 there are two ways in which one can own a book the fi there are one desk and two chair这句话怎么错了 怎么翻译这句英文?some one give up and some one always try,people cry 英语翻译there must be few questions on which responsible opinion there must be no life on the earth这句话怎么理解,用了什么结构,详解.