a serve as b

a serve as b A充当B

It can also serve as a necklace.
这个当然也可以当做项链。

1.  Are you still serving as a security guard? 

2.  The man served the poison as a cake to the woman.

3.  It is said that bad fruits are served as good ones in the grocer.

4.  She has a habit of serving as a dancer in her spare time.

5.  I don’t want to be served as a worthless man.