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1.one by one 一个一个；一个接一个
The students entered the classroom one by one.
学生们一个挨一个地走进教室。
2.promise to 许诺做；承诺
Claire had made me promise to tell her the truth.
克莱尔要我保证把真相告诉她。
3.on board 到船上；上船
We went on board and saw these people packed shoulder to shoulder on the decks.
我们上了船，看见这些人在甲板上肩挨着肩挤在一起。
4.be sure of 对……有把握；确定
I hope so, but nobody can be sure of the future.
我希望能这样，可是对未来谁也没有把握。
