Ball/ bɔːl /

1.noun [c] 
(football,golf ball etc) 球

2.noun [of wool] [ string] 


3.noun
(sphere) 球状

4.noun
(dance) 舞会

5.noun [of foot] [ thumb] 
球形部分

6.vt.[+paper] [ cloth] 
(also: ball up) 把…抟成团

to start {or} get {or} set the ball rolling
开始
to play ball (with sb)
 [inf] [fig] (与某人)协作
to be on the ball
敏锐
the ball is in your court
轮到你了
to have a ball
 [inf] 过得愉快