理论上来说，最好的防晒霜的防晒系数也就最高。
Theoretically, the best sunscreen has the highest SPF number.
即使她从头到脚涂抹上防晒系数是7的防晒霜，她也会被晒伤。
She gets sunburned even when she plasters herself from head to toe in factor 7 sun lotion.
在我的皮肤科医生的建议下，我每天都会在脸上和脖子上涂上防晒系数为15或30 的防晒霜。
For everyday, at my dermatologist's recommendation, I wear a sunscreen of SPF 15 or 30 on my face and neck.
我把自己遮盖起来，涂上厚厚的防晒系数50的防晒霜，并且躲开中午的太阳。
防晒系数为60的防晒霜可能会比防晒系数只有30的要好，但这也没有必要，而且防晒系数为60的防晒产品所达到的效果并不是防晒系数为30的两倍。
A sunscreen with an SPF of 60 might be better than one with an SPF of 30, but not necessarily - and the SPF 60 product isn't likely to be twice as effective as the SPF 30 product.
所有的这一切都会使得最好的防晒霜的防晒效果低于它瓶子上标的防晒系数。
All this can make even the best sunscreen less effective than the SPF number on the bottle would lead you to believe.
英国国家健康与临床优化研究所在其一月份公布的健康指南中曾指出，人们应该涂抹防晒系数不小于15的广谱防晒霜。
The National Institute for Health and Clinical Excellence (Nice) published guidance in January saying people should wear broad spectrum sunscreens with a minimum factor 15 sun protection (SPF).
使用得当的防晒系数为8或更高的防晒霜在完全阻挡紫外线辐射的同时也阻止了维生素d的合成。
Used properly, sunscreens with an SPF of 8 or higher completely block UVB radiation and prevent synthesis of vitamin d.
生产商计算该系数是基于在涂抹了防晒霜和没抹防晒霜的这两种情况下，对皮肤晒红的时间进行的对比。
Manufacturers calculate SPF based on how long it takes to sunburn skin that's been treated with the sunscreen as compared with skin that hasn't been treated with sunscreen.
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.
没有一款高防晒系数(SPF)的防晒霜的保护，皮肤很容易长出日晒斑、雀斑，甚至更严重的会得皮肤癌。
Without application of a sunscreen with a good SPF, skin may be vulnerable to sunspots, wrinkles, and even more serious, skin cancer.
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 sun block with an SPF of 30 or greater.
尽管我涂了防晒系数较高的防晒霜，但在这样的烈日下我还是晒黑了。
Although I wear a higher SPF sunscreen, I also get tanned under the scorching sun.
挑一支防晒系数足够、用起来舒服同时又不能太贵的防晒霜，真是太艰巨的任务。
Pick a sun protection factor adequate, comfortable and not too expensive to use sunscreen, it's very difficult task.
挑一支防晒系数足够、用起来舒服同时又不能太贵的防晒霜，真是太艰巨的任务。
Pick a sun protection factor adequate, comfortable and not too expensive to use sunscreen, it's very difficult task.
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