1. 特别注意、保持机警、机警能干：on balance:总的来说 | be on the ball:特别注意、保持机警、机警能干 | keep one's eye on the ball:专心致志
2. 全神贯注：精疲力尽 be all in | 全神贯注 be on the ball | 上当受骗 fall for sth; fall for sb's line
3. 精明能干的：not have a bone to pick with; 不与...争论 | be on the ball; 精明能干的 | accidentally on purpose:貌似偶然,实则有意.
1. The kid who taught himself to be a great ball handler by dribbling on roller skates couldn't even stand up.
2. She hopes to be on the court for a first training session with the ball at the end of next week.
3. " That will be good because I like playing on the ball and off the ball, " Lawson said.
4. Strauss said England would be celebrating hard on Tuesday but be back fighting hard until the last ball in Sydney.
5. The shot after that would be on a red ball if available - the yellow otherwise.
6. The official tournament ball will be unveiled during the draw ceremony on Friday evening.
7. The ball appeared to be blocked by the keeper and Terry who was prone on the turf.
8. Potting the opponents ball is usually to be avoided since scoring is much harder with only two balls on the table.
verb
1. be well-informed
Synonym: know the score be with it know what's going on know what's what