bear a hand的用法和样例：
- Get him to bear a hand.
- I make a point of giving a hand to others.
- He kept aloof and did not give us a hand.
- They don't want to take a hand in this matter.
- I always make a point of giving a hand to others.
- Jack seemed to bear a charmed life; not a bullet struck him.
- bear a hand 助一臂之力(参加...