of和for的用法与区别越详细越好.希望补充些列句

　　例句：

　　The new drug has great significance for the treatment of the disease.

　　这种新药对于这种病的治疗有重大的意义。

　　For years we had little knowledge of what life was like inside China.

　　以往很多年我们对于中国国内的生活情况所知甚少。

　　He had to go to the hospital for treatment.

　　他不得不去医院接受治疗。

　　My cooking is of the 'quick and simple' variety.

　　我做饭菜属于既快捷又简单的那一类。

　　In school, he was not one of the achievers.

　　上学时他不属于拔尖的那类。

　　This is one of the most commonly used methods.

　　这是最常采用的方法之一。