一张嘴巴/嘴/口 a mouth
一张口
A mouth open
以上为机器翻译结果，长、整句建议使用 人工翻译 。
你一张口，别人就知道你是谁。
Open your mouth and people know who you are.
youdao
我一张口就立刻知道自己说错话了。
I knew almost immediately that I would be sorry I had said that.
他们一张口，人类的知识就会受损失。
They never open their mouths without subtracting from the sum of human knowledge.
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