arris of slab

例句：

1. 1. The engineer measured the thickness of the slab before laying it.
   工程师在铺设之前测量了石板的厚度。
2. 2.The construction crew used a slab to level the ground.
   施工队用石板来平整地面。
3. 3. The slab was so thick that it could not be easily moved by hand.
   石板太厚了，无法用手轻易移动。