4.aboard adv.& prep.在(船、飞机、火车等)上；上(船、飞机、火车等) (1) aboard上(船、飞机、火车等) (2)abroad adv.在国外；到国外 (3) abroad出国 5.settle down坐下；定居；平静下来；专心于 settle down sth. 开始认真做某事；静下心来做某事

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go

to (doing)