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面具;面罩;假面
A mask is a piece of cloth or other material, which you wear over your face so that people cannot see who you are, or so that you look like someone or something else.
例句
The gunman, whose mask had slipped, fled.
面罩掉落的持槍歹徒逃之夭夭了。
...actors wearing masks.
戴面具的演員們
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（防細菌或有害物質的）防護面罩,面具，口罩
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.
例句
You must wear goggles and a mask that will protect you against the fumes...
為了免受煙霧危害，你必須戴上護目鏡和面罩。
She wore a surgical mask and rubber gloves while she worked with the samples.
她處理樣品的時候戴著手術口罩和橡膠手套。
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(掩蓋真實感情或性格的)偽裝，掩飾
If you describe someone's behaviour as a mask, you mean that they do not show their real feelings or character.
例句
His mask of detachment cracked, and she saw for an instant an angry and violent man.
他冷靜超然的偽裝破碎了，一瞬間她的面前出現了一個憤怒而又狂暴的男人。
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（護膚用的）面膜
A mask is a thick cream or paste made of various substances, which you spread over your face and leave for some time in order to improve your skin.
例句
This mask leaves your complexion feeling soft and supple.
這種面膜能使你的皮膚變得柔軟細嫩。
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VERB
掩飾(情感);偽裝
If you mask your feelings, you deliberately do not show them in your behaviour, so that people cannot know what you really feel.
例句
Dena lit a cigarette, trying to mask her agitation.
德娜點燃了一根煙，試圖掩飾不安。
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VERB
遮住;掩蔽;使…不易察覺
If one thing masks another, it prevents people from noticing or recognizing the other thing.
例句
A thick grey cloud masked the sun...
一片厚厚的烏云遮住了太陽。
Too much salt masks the true flavour of the food...
太多的鹽會蓋住食物本來的味道。