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.
Yes. Wash your hands with soap at the end of your experiment.
可以。在实验结束时要用肥皂洗手。
Do you remember one afternoon ten years ago when I came to your house and borrowed a necklace of yours? Pierre, my husband, was working in a government office. We'd been invited to a ball at the palace so I needed to borrow some jewellery.