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“作壁上观”，汉语成语，原指双方交战，自己站在壁垒上旁观（watch the fighting from the ramparts）。后多比喻站在一旁看着，不动手帮助，可以翻译为“sit by and watch，be an onlooker/by-stander”。
例句：
他们吵得不可开交，你要去制止，不能作壁上观。
They are quarreling fiercely. You should go and stop them rather than sit and watch.
Editor: Jade
来源：chinadaily.com.cn