If curium the floor that come down has a rabbet, and odd dimension is in 30 centimeters of above, because the width of earthworm is 30 centimeters, so can very use again conveniently.

• 假如锯下来的地板有榫头，而且剩余尺寸在30厘米以上，因为地龙的宽度就是30厘米，所以可以很方便地再次利用。