复合趋向补语 The complex directional complement

Directional verbs(上，下，进，出，回，过，起），followed by simple directional complments(来，去）,can be used as complex directional complements to other verbs. this kind of directional complement indicates a certain compound direction of the action, and give a more specific description of the action.for example:
我从山上跑下去。
他们从外边走进来了。

Commonly used complex directional complements are :

The basic meanings of these complex directional complements:
上来---to come up 上去-----to go up
下来----to come down 下去---to go down
进来---to come in 进去---to go in
出来----to come out 出去----to go out
回来----to come back 回去---to go back
过来---to get up 过去---to go over
起来---to get up
The relation between the direction of the action and the speaker （or the topic being discussed）, which is indicated by “来” and “去”， is the same as in the case of a simple directional complement.
If an object is present after the verb with a complex directional complement, and the object must be placed before “来” 偶然“去”。For example:
我们爬上长城来了。
我要多拍些照片寄回家去。