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无论是在茂密的森林中探险在渺无人烟的大漠中跋涉或是在浩瀚的海洋中航行，人们往往会辨不清方向，这时，一个小小的仪器──指南针便派上了用场，它可以让人们在地球上的几乎每一个角落都“找得着北”。指南针是利用磁铁在地球磁场中的南北指极性而制成的一种指向仪器，它同
Whether exploring the lush forests in the deserted desert or navigating the vast oceans, people tend to discern the direction in which a small instrument - a compass - comes in handy Let people “find the North” in almost every corner of the globe. Compass is the use of magnets in the Earth’s magnetic field north and south finger polarity made of a pointing device, which