用了根相互垂直的丝，可以制成方向传感器。

Perpendicular with the root of the wire, the direction sensor can be made.

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这两条线相互垂直。

The two lines are perpendicular to one another.

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特别地，可以用这个，来检验两个向量是否相互垂直。

And, in particular, we can use this to detect when two vectors are perpendicular.

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特别地，可以用这个，来检验两个向量是否相互垂直。

And, in particular, we can use this to detect when two vectors are perpendicular.

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