Each motorcycle driver has to wear a mask.

每个摩托车驾驶员都得戴面罩.

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Why not wear a mask a precaution?

为什么不带个口罩,以防万一?

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Respiratory disease should occur to people to avoid crowded areas, and ground to wear a mask.

出现呼吸道疾病的人员应避免去人多拥挤区域, 并勤戴口罩.

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Wear a mask when respiratory symptoms or fever develop. See a doctor right away.

有呼吸道感染徵状或发烧时,应戴上口罩,并及早求医.

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In our lab everyone is supposed to wear a mask to protect himself from radioactive materials.

在我们的实验室,人人都要戴面具,以防放射性材料.

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Other roles, whether male or female, wear a mask and are all played by men.

其它角色均戴面具,而且无论男女角色均由男子扮演.

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