noun [专属名词] 面罩，口罩；防毒面具，呼吸面罩；面膜；假面具，假面；伪装，掩饰；表情，面容；遮盖物，遮蔽物；（古希腊和罗马演员佩戴的）人头面具；遮光板，遮光片；（制造微电路用）模板；（蜻蜓幼虫）脸盖
A mask is a piece of cloth or other material that you wear over all or part of your face to protect you from germs or harmful substances. 防护面具
verb [vt. 及物动词] 掩饰，伪装，隐瞒；盖住（气味、味道、声音等）；遮盖；戴面具
If you mask your feelings, you deliberately do not show them in your behaviour, so that people cannot know what you really feel. 掩饰
