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又到了夏天，美白防晒又是爱美的职场人关注的话题之一了。很多朋友选防晒霜的时候会觉得SPF指数越高越好，那么实际情况是怎么样呢？一起来看看吧
There are many misconceptions with sunscreen. You have those people who think that getting the highest SPF will protect them better than a lower SPF. Then, there are those who won"t use sunscreen with a high SPF because they think they won"t get a tan.
对于防晒有不少误区。很多人总是认为高的SPF比低SPF能更好的防晒。还有一些人认为自己不会晒黑，所以根本不会使用高防晒指数的防晒霜。
Here are the facts.
然而事实并非如此。
Higher SPF"s aren"t always necessary. You need to look at a couple of things when you are shopping for sunscreen. First, how light is your skin tone? Those with lighter skin will usually burn faster than those with darker or olive skin. If your skin starts to turn red fast, you"ll want a higher SPF.
高的防晒指数并非总是必需的。当你购买防晒霜时，你需要考虑以下几点。首先，你的肤色如何?亮色皮肤总比暗色或橄榄色肌肤的人容易晒伤。如果你的肌肤很容易变红，那你需要高防晒指数的防晒霜。
But what does the SPF rating really mean?
但是防晒指数等级到底指的是什么呢？
SPF stands for Sun Protection Factor. To figure out how long you are safe from the sun (at least the UVB rays) you need to do a little math. Take the number of SPF and multiply it by 10. That is the time that if you were under perfect conditions, you"d be safe from the sun"s rays.
SPF是防晒系数的意思。需要通过一定的计算才能知道你在太阳下可以待多久而不被晒伤（至少不被UVB射线晒伤）。将SPF系数乘以10得出来的时间是你在涂防晒产品的情况下的保护时间。
For example: SPF 20 x 10 = 200 minutes of sun protection
例如：SPF20的防晒产品可以可保护你达200分钟之久。
Perfect conditions mean that you aren"t in water or sweating, two things that usually go hand in hand with the sun. This also doesn"t reflect sunscreen that can rub off from your clothing.
理想的条件意味着你不是在水里或出汗。而这两个事情通常和阳光密切联系在一起。但这也并不反应防晒霜会被你的衣服所擦掉。
Because you want to be safe from the sun, I"d recommend applying every 1-2 hours, no matter the SPF.
因为你想防晒，所以我推荐不管防晒系数是多少，每隔两个小时涂一次。
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