To echo each other's words; to sing the same tune; to collude in support of each other, often with mutual flattery or agreement.
在小组讨论中，他们俩总是“一吹一唱”，互相补充，让观点听起来更有说服力。
In group discussions, those two always echo each other's points, complementing each other to make their arguments sound more convincing.
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