circle/ 'səːkl /

1.noun [c] 
圆圈

2.noun [c] [of friends] 
圈子

He has a small circle of friends.
他有一小圈朋友。
3.noun [s] 
(in cinema,theatre) 楼厅

4.vi.[bird] [ plane+] 
盘旋

5.vt.
(move round,surround) 环绕