锡膏防护层

caste mark───种姓标记

caste marks───种姓标记

face mask───面罩；面具

gas mask───防毒面具，毒气面具

pass mark───通过分数；合格分

master mason───梅森大师

past master───n.老手；对某种技艺有丰富经验者

If the entire string only contains valid characters, according to their paste position in the input mask, then the entire operation will succeed.───如果整个字串仅包含有效的字元(根据其在输入遮罩中的贴上位置)，整个作业将会成功。

a disposable health face mask piece, which is composed of a plastic face of an outer layer, face mask paste of a middle layer and a lining gauze.───一种一次性保健面膜块，是由外层塑胶面、中间层面膜糊、里层纱布组成。

Make a paste with two aspirin and water and use as a facial mask.───将二片阿斯匹林和水做成糊状物，并用作面膜。