求翻译：因为内孔为六边形，精加工比较麻烦，而且内孔公差要求较高，这样合格率会较低，生产成本会较高，如果公差提高到+0.20，这样成本就会降下来。是什么意思？

Too much trouble because the bore is hexagonal, finishing, and bore tolerances require a higher, so that the qualified rate will be lower production costs will be higher, if the tolerance to +0.20, so the cost will come down.

Because the hole is 6, finishing more cumbersome, but the hole tolerance is high, so pass rate will be lower, production costs would be higher, if tolerance to + 0.20 so that cost will come down.

Because in the hole is a hexagon, the precision work quite is troublesome, moreover in the hole common difference request is high, such qualified rate can be low, the production cost can be high, if the common difference enhances to +0.20, such cost can descend fall.

Because the hole is hexagonal, finishing more trouble, and bore tolerances require higher pass rate will be lower, the production cost will be higher, if the increased tolerance to +0.20, so the cost will come down.

正在翻译，请等待...