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视频对白：
Definitely, Thank you, Mason's on board.
当然，谢谢，毛森在船上。
That's good.
很好。
今天要学习的词组为：on board
意为“在船（火车，飞机，汽车）上；已装船”。
例句：
1. When all the people were on board, the boat bore away.
当所有人都上船后，那艘船离岸了。
2.The plane burst into flames,killing two of the airmen on board.
飞机突然起火，机上的两名飞行员丧生。
