the ball is in your court

it is up to you to make the next move

下一步就看你的了

a ball of fire

a person who is full of energy and enthusiasm

生龙活虎的人

the ball of the foot

the rounded protuberant part of the foot at the base of the big toe

大脚趾球

the ball of the thumb

the rounded protuberant part of the hand at the base of the thumb

拇指球

have a lot (或 not much) on the ball

have a lot of (or not much) ability

很有（或没什么）能力

keep the ball rolling

maintain the momentum of an activity

使活动继续

keep one's eye on (或 take one's eye off) the ball

keep (or fail to keep) one's attention focused on the matter in hand

集中（或未能集中）注意力

on the ball

alert to new ideas, methods, and trends

敏锐的，机警的

play ball

play a ball game such as baseball or cricket

打球

start (或 get , set) the ball rolling

set an activity in motion; make a start

开始活动

the whole ball of wax

(N. Amer. informal)everything

(北美， 非正式)全部；所有

have a ball

(informal)enjoy oneself greatly

(非正式)狂欢，玩个痛快

ball up

To confuse; bungle.

困惑；搞砸

on the ball【非正式用语】

Alert, competent, or efficient

警惕的，有能力的或有效率的

a teacher who is really on the ball.

能干的老师

Relating to qualities, such as competence, skill, or knowledge, that are necessary for success

成功的必备条件：关于能力、技巧或知识等成功所必要的品质

a manager who has a lot on the ball; a student who has nothing on the ball.

一个很能干的经理；一名什么也不会的学生