groove diameter

例句：

1. 1. The groove in the floor is too deep for a shoe to fit through.
   地板上的槽太深，鞋子穿不过去。
2. 2. The grooves on the surface of the stone are smooth and even.
   石头表面的凹槽平滑且均匀。
3. 3. The grooves in the wood are deep enough to hold the screws.
   木头上的凹槽足够深，可以容纳螺丝。