讲解文本：

hear a pin drop 听见针的掉落（形容安静，通常因为吃惊或兴奋）
It was so quiet. You could hear a pin drop.
当时安静极了，连针掉落也听得见。
There was no one in the house. You could even hear a pin drop.
房子里空无一人，安静得连针掉落都听得见。

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