He held that job for four years and then worked his way up to being a school safety monitor.
他那份工作做了四年，之后通过努力成为了一名学校的安全监督员。
2
They can monitor local city councils, county commissioners, and local school boards, and report on them.
他们可以监督当地的市议会、县长，以及当地学校委员会的活动，并且对这些活动做出汇报。
3
One unnamed school in Kent issued children with the technology to allow them to monitor the performance of staff - and pass instant judgments to senior teachers.