又到了夏天，美白防曬又是愛美的職場人關注的話題之一了。很多朋友選防曬霜的時候會覺得SPF指數越高越好，那么實際情況是怎么樣呢？一起來看看吧

    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.

    對于防曬有不少誤區。很多人總是認為高的SPF比低SPF能更好的防曬。還有一些人認為自己不會曬黑，所以根本不會使用高防曬指數的防曬霜。

    Here are the facts.

    然而事實并非如此。

    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.

    高的防曬指數并非總是必需的。當你購買防曬霜時，你需要考慮以下幾點。首先，你的膚色如何？亮色皮膚總比暗色或橄欖色肌膚的人容易曬傷。如果你的肌膚很容易變紅，那你需要高防曬指數的防曬霜。

    But what does the SPF rating really mean?

    但是防曬指數等級到底指的是什么呢？

    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是防曬系數的意思。需要通過一定的計算才能知道你在太陽下可以待多久而不被曬傷（至少不被UVB射線曬傷）.將SPF系數乘以10得出來的時間是你在涂防曬產品的情況下的保護時間。

    For example: SPF 20 x 10 = 200 minutes of sun protection

    例如：SPF20的防曬產品可以可保護你達200分鐘之久。

    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.

    理想的條件意味著你不是在水里或出汗。而這兩個事情通常和陽光密切聯系在一起。但這也并不反應防曬霜會被你的衣服所擦掉。

    Because you want to be safe from the sun, I'd recommend applying every 1-2 hours, no matter the SPF.

    因為你想防曬，所以我推薦不管防曬系數是多少，每隔兩個小時涂一次。