thickness
n
1 [U] quality or degree of being thick 厚、 密、 浓、 混浊等(的程度)
4cm in thickness/a thickness of 4cm 厚4厘米[4厘米的厚度].
2 [C] layer 层: one thickness of cotton wool and two thicknesses of felt 一层棉絮及两层毛毡.
3 [C] part (of sth) that is thick or between two opposite surfaces (某物的)较厚的或夹在两层中间的部分
steps cut into the thickness of the wall 在墙的横断面凿出的台阶.