网友回答：
when i came back from school，水烧开后，在电瓶车上，if you don t believe it，我把这件事告诉了妈妈， 我放学回来时， which is the principle of heat expansion and cold contraction！但是，瓶子就要爆炸了，热胀冷缩的原理，i told my mother about it. she said that she had never paid attention to this phenomen
温馨提醒：随时光变迁，文中所陈述观点；准确性、难免有所变动，因此文中观点仅供参考。
