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- 问题详情：Vaccines(疫苗)maysoonmaketheirfirstfilmappearance.LedbyexpertMariaA．Croyle,researchershavedevelopedathinsheetthatpreservesvaccinesforlongperiodswithoutrefrigeration.Thismeansthecarefullycooledsmallbottlesnowusedtoshipvaccinescouldpotentiallybe...
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