他说：“网格中有一些间隙，在这些间隙里交叉着很小的自然排水渠道，而这些线条本身却没有完全被充填，有着许多小的条纹和不均匀的覆盖范围。”
They have gaps in them where they cross little natural drainage channels and the lines themselves are not perfectly filled in, with lots of little streaks and uneven coverage.
再根据系统确定的操作过电压倍数及电气绝缘强度（空气间隙）来确定在人不宜到达地方的交叉跨越距离；
We decide the cross and span clearance by over-voltage times and electrical insulation strength (air spacing) from the system major in places that the public not easy to arrive.
目的：通过研究全膝关节置换中后交叉韧带切除对于胫股间隙的影响来探讨其在全膝关节置换中的临床意义。
Objective: To evaluate the effect of posterior cruciate ligament resection on the tibiofemoral joint gap and its clinical value in total knee replacement.
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