be engaged to;be betrothed to;engage;promise to marry;engage oneself to ;
例句:
John and Jill are engaged.
约翰与吉尔订婚了.
We got engaged on my eighteenth birthday.
在我18岁生日那天我们订婚了。
I felt our engagement was quite an unhappy time.
我觉得我们订婚期间非常不愉快。