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在农业、林业调查中,常常需要测量树木高度。树木是垂直于地面向上生长的,如果我们设法把树高变为水平长度,那就容测量了。
In agriculture and forestry surveys, it is often necessary to measure the height of trees. The trees grow up perpendicular to the ground, and if we try to change the height of the tree to a horizontal length, then we measure it.