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कितने प्रभावी हैं?
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यह स्निपेट कोविड-19 के प्रसार को रोकने में शारीरिक दूरी बरतने, मास्क पहनने और आँखों को सुरक्षित रखने जैसे उपायों के असर का पता लगाने वाले अध्ययनों का सार प्रस्तुत करता है।
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