Do you know that you can use your watch as a compass on a sunny?

你知道当晴天时你的手表可以用作指南针吗？

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Suppose you decide to make a trek to the North Pole. You can't catch a plane there. So instead, you pull out your compass, watch the needle swing northward and plot a path, right?

假设你决定长途跋涉去北极，又不能坐飞机去，那么只好拿出指南针，根据指向北方的指针绘制出路径，对么？

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