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Greenlandwas discovered without the use of magnetic compasses .

格陵兰岛被人类发现没有借助于磁罗盘。

Guns , magnetic compasses and movable-type printing were all created there .

大炮、磁罗盘和活字印刷术都是由中国发明的。

What 's more , these compasses would be small and would consume very little energy .

另外，这些新型罗盘将小巧玲珑并且能耗极低。

Recently , highly sensitive compasses guided engineers as they drilled relief wells in the gulf of mexico after the deepwater horizon blowout .

就在最近，在墨西哥湾的深海钻井平台爆炸之后，高敏感罗盘指引着工程师们进行了钻凿减压井的工作。

Another accidental discovery just like gunpowder , the earliest compasses were not used for their intended purpose and were not based on magnets .

像火药一样，这又是一个意外的发现，最早的罗盘并非用于指引方向，也不是用磁铁制成。