engage in和be engaged in有何区别?

vt.
1.吸引;占用(时间、精力等)
The book engaged my full attention.
这本书把我完全吸引住了.
Housework engages much of her time.
家务事占用了她很多时间.
2.使(齿轮等)啮合
3.与...交战,进攻
4.雇,聘[(+as)][O2]
They engaged a cook for the summer.
那个夏天他们雇了一个厨子.
5.预订(房间、座位等)
6.使订婚[H]
David is engaged to Ann.
戴维与安妮订了婚.
7.使从事,使忙于[H]
He was busily engaged in painting the furniture.
他忙于油漆家具.
8.保证
The company engaged to finish the building by May.
那家公司保证五月份造好房子.
vi.
1.啮合,接合[(+with)]
2.交战,交手[(+with)]
3.从事,参加[(+in/upon)]
They engage in the study of music.
他们从事音乐研究.
4.保证;答应
从事
He has engaged in farming for 20 years.
他从事耕作已有二十年.
engaged
a.
1.从事...的;忙于...的[(+in/on)][F]
He is engaged in his business.
他忙于他的生意.
We are engaged in compiling a dictionary.
我们正忙于编一本字典.
2.已订婚的[(+to)]
Bill is engaged to Betty.
比尔和贝蒂订了婚.
Edward and I are engaged.
爱德华和我订了婚.
3.(时间)被占用的;【英】(电话)使用中的[F]
The number is engaged.
该电话正在讲话中.
My time is fully engaged.
我的时间完全被占用了.
从事于;忙于;埋头致力于
She was engaged in protecting wild birds.
她致力于保护野生鸟类的工作.
She is now engaged in writing letters.
她现在正忙着写信.