You should know how to protect yourself from dust storms.
你应该知道如何保护自己免受沙尘暴的侵袭。
You don't know how to protect yourself.
不知道如何保护你自己。
Understand these important health risks and know how to protect yourself.
了解这些重大健康风险，认识如何保护你自己。
Understand these important health risks and know how to protect yourself.
了解这些重大健康风险，认识如何保护你自己。
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