一顶点被丢弃的登山绳，一些被撕破的塑料薄膜或甚至是一只旧的徒步旅行靴，在野外都会大有用处。
A bit of discarded climbing rope, some ripped plastic sheeting or even an old hiking boot can be of great use in the woods.
三角测量通过以分别作（顶点）的两个已知点和一个未知点形成一个三角形，来求出或定位该未知点，如在航海中。
The location of an unknown point, as in navigation, by the formation of a triangle having the unknown point and two known points as the vertices.
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