1.assure to使确信；使放心；确保

例句： I can assure you that your son will be happy here.
我可以向你保证，你儿子在这里会很快乐的。

2.enter into进入； 参加； 建立； 开始

例句：I refused to enter into any correspondence (ie exchange letters) with him about it.
我决不就这一问题与他通信。

3.lost in沉迷在(热衷于)

例句：He looked up at the azure and was lost in thought.
他抬头看着蓝天，沉思起来。

4.intreat him to恳求； 乞求

例句：They intreat me to acquaint her with it.
他们一定要我把这件事告诉她。