嗯．過去的解剖書上都是這麽寫的．現在的理解是：

來源: 於 2014-07-16 19:07:34 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists.

Amazing Heart Facts - PBS