Dust masks are graded according to the protection they offer.
防尘面具根据其提供的防护而分级。
People have to wear thick masks almost every day.
人们几乎每天都要戴厚厚的口罩。
These masks and headdresses themselves are a very part of the art.
这些面具和头饰本身就是艺术的一部分。
National data masks the very large variation in the performance of individual universities.
全国的数据掩盖了个别大学表现的巨大差异。
Can masks help stop flu spread?
口罩对阻止流感传播有帮助吗？
Perhaps they were wearing masks?
或许他们戴着面具？
Look at those funny masks, Dad.
爸爸你看那些面具多有趣。
All guests wore masks to the ball.
所有客人都戴假面具参加舞会。
一定要戴上面具吗？
Remember that masks are quite helpful.
请记住，面具是相当有益的。
Many of them wore face masks and overcoats.
他们中的很多人头戴面具，身披外套。
保护面罩。
Mr. Kress stepped up his work on the masks.
Kress戴着面具加紧工作。
The pair inside wore face masks and white gloves.
车内的两个人带着面罩和白色的手套。
我喜欢面具。
To the uninitiated this masks an important truth.
对外行来说，这只是一个假象，掩盖了事实。
Even the mask of life are masks of deeper mystery.
就是生命的面具也都是更深的奥秘的面具。
You can also use masks and frames, and add effects.
你也能够使用面罩和框架，加入效果。
Masks for Halloween were on sale by the late 19th century.
万圣节面具在19世纪后期开始作为商品出售。
Provide surgical gloves and masks for security staff.
提供口罩及手套给保安人员。
We chose surgical masks as an essential tool for that.
我们选择把医用口罩作为这样做的一个必要工具。
Surgeons wear masks to prevent the spread of infection.
外科医生戴着口罩以防止传染病的传播。
The masks are time-consuming to make, and they're not cheap.
面具的制作很耗时，当然也不便宜。
On that day, they always make pumpkin lanterns and wear masks.
在那一天，他们总是做南瓜灯笼、戴面具。
Many of the dancers at the fancy dress ball wore colorful masks.
化装舞会上的许多跳舞者戴着五颜六色的面具。
The gas masks were collected last year because they were out of date.
去年，这些防毒面具由于过了有效期而被收回。
The gas masks were collected last year because they were out of date.
去年，这些防毒面具由于过了有效期而被收回。
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