Make sure you leave a small border around the outer edge of the liner that does not have any leaves on it, like a small frame.

确保在衬垫外沿没有叶子的地方留下一圈边，像一个框那样。

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Continuous concrete wall is used in the air shaft structure, which is built with inversed construction method by using inner liner and transverse frame.

风井采用地下连续墙围护结构，通过内衬及横向框架逆作施工方法实现。

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