be engaged in的用法和樣例：
例句
用作及物動詞 (vt.)
- We are engaged in writing a letter.
我們正忙於寫信。 - He was employed in watering the garden.
他忙於給花園裡的花木澆水。 - He is engaged in the development of his business.
他正致力於發展他的營業。 - He went to work in astronomy looking for new stars.
他開始致力於天文工作，尋找新的恆星。
辭彙搭配
- be engaged in 忙於 ...
