https://online2.tingclass.net/lesson/shi0529/0009/9907/927.mp3
https://image.tingclass.net/statics/js/2012
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。
