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你想知道,怎样在不用爬树的条件下就能测量出大树的高度?怎样在航行途中测出海上两个岛屿之间的距离?怎样测量底部不可到达的建筑物的高度?怎样在水平飞行的飞机上测量飞机下方山顶的
You want to know how to measure the height of a tree without climbing trees, how to measure the distance between two islands on the sea, how to measure the height of a building that is not reachable at the bottom, and how to measure the height of the building. Measuring the top of the plane below the plane on a flying aircraft