they get to america by plane 飞机用变复数吗?怎么变

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theygettoamericabyplane飞机用变复数吗?怎么变theygettoamericabyplane飞机用变复数吗?怎么变theygettoamericabyplane飞机用变复数吗?怎

they get to america by plane 飞机用变复数吗?怎么变
they get to america by plane 飞机用变复数吗?怎么变

they get to america by plane 飞机用变复数吗?怎么变
不用,by + 交通工具,且交通工具用单数形式,比如:by bus/bike/train...

单数