铅垂线若垂得直下去——就是那谷壁极陡——他就在谷底照实量那谷的宽,不把两壁算在内。
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铅垂线若垂得直下去——就是那谷壁极陡——他就在谷底照实量那谷的宽,不把两壁算在内。
However, if a plumb line drops straight down, i.e., if the canyon wall is very steep, he measures the width of the canyon properly at the bottom of the canyon, without taking its walls into account.