| n 用法:
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]. 用法:
2 [C] layer 层:
one thickness of cotton wool and two thicknesses of felt 一层棉絮及两层毛毡. 用法:
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. |