记住以下重点:首先是手的部位palm 手掌back of hand 手背fingertip
英文版预防病毒正确洗手步骤贴士海报
日本研究发现新型冠状病毒存活在皮肤上比流感病毒高5倍长达9小时
a:we can supply the sample if we have ready parts in stock, but
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