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When we choose a sunscreen, we can compare application method, the SPF, and the active ingredients.
當我們選擇防曬品時可以比較一下使用方法，SPF值，和活性成分。
Sprays can be convenient to put on, especially when you're wet,
噴霧使用起來比較方便，尤其是當你身上濕了時候，
but a recent study found that most people don't apply a thick enough layer to get full protection.
但最近的一項研究發現，大多數人沒有噴到足夠厚以得到充分的保護。
And the possible health risks of inhaling sunscreen compounds from a spray cloud
而且吸入防曬化合物可能帶來的健康風險
might make you consider reaching for that bottle of lotion instead.
也許會讓你考慮用一瓶霜來代替。
Opt for a sunscreen with an SPF of at least 15, although 30 is better.
選擇具有至少15的SPF防曬劑，雖然30更好。
SPF is a nonlinear scale of how much UVB radiation is needed to give protected skin a sunburn.
SPF是指需要多少非線性標度給皮膚保護以防被UVB照射曬傷。
SPF 15 does a pretty good job by blocking 93% of UVB rays.
SPF15通過阻斷93％的UVB射線起到了很好的作用。
You get a slight increase as SPF goes up, with SPF 30 blocking 97%, and 50 blocking 98%.
隨著SPF上升略有提高，SPF30可以阻擋97％，50可以阻斷98％。
SPF is based on the quantity of solar exposure.
SPF是基于太陽能曝光量來定的。
So how much time you have before you start to burn really depends on a long list of factors,
所以，你在曬傷之前有多少時間，實際上取決于一長串的因素，
including your genetics, and when, where, and how you spend your time in the sun.
包括你的遺傳，何時，何地以及你在陽光下干什么。
Even though US marketed sunscreens have been deemed safe by the FDA,
盡管美國市場上銷售的防曬霜已被FDA認定為安全，
scientists are still researching the effects of many active ingredients on the human body.
科學家們仍在研究多種活性成分對人體的影響。
So if you're worried about potential irritants, look for mineral-based formulas with zinc oxide or titanium dioxide.
所以，如果你擔心潛在的刺激，那就找找含有氧化鋅或二氧化鈦的礦物質公式。
Even though they may go on a bit thick at first, they're less irritating than carbon-based chemical sunscreens.
盡管開始的時候可能會厚一點，但是他們比碳基化學防曬劑的刺激性較小。
These mineral-based sunscreens are preferential for the environment, too.
這些礦基物防曬霜對環境也更好。
