a Jack in office的用法和样例：
- In office herself, she helped him get a job.
- A Jack of all trades is in master of none.
- Come, come, thou art as hot a Jack in thy mood as any in Italy, and as soon moved to be moody, and as soon moody to be moved.
- A stationary ball in lawn bowling; a jack.
- A Jack of all trades in master of none.