be engaged upon

• 着手

be engaged upon的用法和样例：

例句

1. He is engaged on a study of population.
   他着手於人囗的研究。
2. The job is in hand and will be finished soon.
   工作已经着手进行，不久便可完成。
3. He is engaged in scientific pursuit.
   他从事科学研究。
4. You'll be in trouble if you don't watch your step.
   你要是不谨慎从事就要倒霉了。