保护系数(protection factor，PF)或剂量减少系数(dose reduction factor，DRF) 是评价使用放射保护剂效果的指标...
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矿物成分能很好地和油性肤质亲和，加上自然的防晒系数，就能提高皮肤中的抗氧化酶的保护效应，从而帮助抵御皮肤的幼纹和一些不平衡基调。
"Minerals work well with oily skin, have a natural SPF, and enhance the protective effect of antioxidant enzymes in the skin that help prevent fine lines and uneven tone, " advises Graf.
只有人们把防晒霜涂得很厚时，15倍的防晒系数才能够起到全天保护的作用。
Factor 15 offers all-day protection only if it is applied thickly.
常年使用SPF30或防晒系数更高的防晒霜来保护皮肤。
Protect your skin from the sun all year round with a sunblock with an SPF of 30 or greater.
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