英国人认为，如果提升海平面，会将假想的线从沿地球曲线的海岸延伸到喜马拉雅山下方的某个点。
The British assumed that carrying in sea level would extend an imaginary line from the shore along Earth's curve to a point beneath the Himalaya.
有一个办法想起来就很简单，假想你在圆柱外,绕着曲线C走。
One way to think about it, actually, it's quite easy, you mentioned that you're walking on the outside of the cylinder along C prime.
假想这条曲线具有这样的的性质，每一条垂线与其至多相交一点。
We assume this curve has the property that every vertical line intersects it once at most.
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