Unverified90% confidenceDecision RuleTime unknown
防晒需在出门前15-20分钟涂抹以形成保护膜，且用量要足（面部约一元硬币大小/1.25ml），用量不足会导致实际SPF大幅下降，涂太薄的SPF50实际可能只有SPF20的效果
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