Map and compass: In case you wander from the trail.

地图和指南针：迷路时用得上。

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An iron case will keep the Earths magnetic field away from the compass.

铁箱能使地球磁场影响不了指南针。

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The compass is housed in a round, wooden case.

罗盘采用的是圆形，木箱。

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The compass is housed in a round, wooden case.

罗盘采用的是圆形，木箱。

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