指南针，是谁发明的？

The compass was invented in China. 指南针是中国人发明的。 Long ago, people found a strange rock. 很久以前，人们发现一种奇怪的石头。 The rock always pointed to the north. 这种石头总是指向北方。 They made it into a tool called Si Nan. 他们把它做成叫司南的工具。 Later, sailors used it to find their way. 后来，水手们用它来认路。 Today, every phone has a compass inside. 今天，每个手机里都有指南针。