将某一过流断面分成面积相等的两部分的点的连线
冰川中间的流线型条纹是由冰川在移动过程中夹带的泥土和岩屑形成的。
Down the middle of the glacier run stripes caused by the dirt and debris the glacier has picked up as it moved.
还有一部楼梯在尽端，连接中间层和最上层，确保卧室部分不被流线干扰。
There is also an extra staircase at one end that links the middle and uppermost levels, ensuring no bedrooms are used as access routes.
滑水而不要‘耕’水，把你的中间名叫为‘流线’。
Slice through the water, don't plow. Make your middle name"streamline".
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