其结构是固定的，意思上的主语并不是句子的主语。

　　generally speaking　一般说来

　　talking of 说道

　　strictly speaking 严格的说

　　judging from 从判断

　　all things considered 从整体来看

　　taking all things into consideration　全面看来

　　Judging from his face, he must be ill.　从他的脸色看，他一定是病了。

　　Generally speaking, dogs can run faster than pigs. 总的来说，狗比猪跑得快。