Are bang（帮）bang mang（帮忙）bang zhu（帮助）interchangeable ...

帮" （vt）"请帮我开门！qing bang wo kai men!" Help me to open the door, please! " 帮助"(v) "帮助别人是我的乐意bangzhu bie ren shi wo de leyi" Helping others is ...

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