The dog days of summer are here. While soaking up the sunshine is a must, exposing our skin to ultraviolet (UV) radiation poses some serious health hazards. This is where sunscreen comes in handy to protect our skin.
隨著大熱天的來臨，曬日光浴是必不可少的環節。但我們的皮膚赤裸裸地暴露在紫外線下，很容易危害健康。想要保護我們的皮膚，防曬霜就派上了大用場。

However, different scenarios call for different types of sunscreen. Here, let’s take a look at the choices available to let you enjoy a vibrant and healthy summer in the sun.
不過，不同情況需要的防曬霜也各不相同。下面，就一起去看看有哪些防曬選擇，讓我們健康有活力地享受夏日陽光！


Day of commuting and indoor fun
通勤與室內活動

Scenario: You’re headed to the office or school, or are engaging in indoor activities that require little time in the sun.
適用情境：去公司上班、去上學，或是參與幾乎曬不到太陽的室內活動。

SPF (Sun Protection Factor) requirement: 15 or less
防曬系數: ≤15

Solution: Even a two-hour shopping spree in a brightly lit indoor mall is equivalent to spending about an hour in the sun, because fluorescent light bulbs also emit UV rays.
防曬建議：在燈火通明的購物中心里掃貨兩小時，幾乎等于在大太陽底下曝曬一小時，因為商場里的各種熒光燈也會產生紫外線輻射。

A moisturizer, sunblock or foundation with an SPF is the perfect choice. Many have an SPF of no more than 15, which is usually sufficient to avoid damaging UV rays. But if you’re still worried about the protection effect, you can also double up. Use a moisturizer or a BB cream, and then top it off with an SPF 15 sunscreen.
此時，保濕霜，隔離霜，或者有防曬功能的粉底霜都是不錯的選擇，通常，大多數此類產品有都防曬作用（SPF≤15），足以防護具有殺傷力的紫外線。如果你仍然不太放心，還可以強強聯合——先用保濕霜或者BB霜，然后，再涂一層防曬系數15的防曬霜。

Season for traveling and outings
外出旅游與戶外活動

Scenario: Exploring a city on foot is the best way to absorb the local culture. But strolling around also takes time and exposes your skin to UV rays.
適用情境：想要體驗當地文化，在一個城市中徒步探索是最好的選擇，然而，到處溜達不僅占了時間，也使我們的皮膚長時間暴露在陽光下。

SPF requirement: 30 or less
防曬系數: ≤30

Solution: Wearing a hat and long-sleeved clothes is sensible, but putting on a sunscreen with a broad-spectrum SPF of 30 is the ultimate protection, especially during the peak hours for sunrays between 10 am and 4 pm. However, sunscreen often degrades fast when exposed to the sun for more than an hour, so make sure you reapply it at least every 90 minutes.
防曬建議：帶帽子、穿長袖都是明智選擇，然而，終極保護還是需要防曬系數30的廣譜防曬霜，特別是在日照最強烈的早10點至下午4點之間。需要注意的是，暴露在太陽下一小時以后，防曬霜的保護效果會迅速下降，所以，保險起見，建議至少每一個半小時重新涂抹一次防曬霜。

Keep fit and healthy
運動與健身

Scenario: Many of us choose the summer to get rid of extra weight for a slimmer figure. But working up a sweat in the sun can compromise the protection offered by sunscreen.
適用情境：大多數人都會選擇在夏天減肥，讓身材更加苗條，不過，在陽光下大量流汗會減弱防曬霜的防曬效果。

SPF requirement: 45 or more
防曬系數: ≥45

Solution: Sunscreen with SPF of 45 and a water-resistant formula is strongly recommended. You can also look specifically for sunscreens made for athletes, such as a non-greasy spray that is not only convenient to carry with you, but also dries quickly so that it won’t run into your eyes. However, a water-resistant sunscreen cannot maintain its SPF very long when you are sweating, so you had better reapply it every 40 minutes.
防曬建議：這種情況下，強烈推薦防曬系數45并且含有防水配方的防曬霜。你可以專門關注運動員專用的防曬霜，例如非油性噴霧，它不僅便于攜帶而且干得很快，不會流進眼睛。但是，當你流汗時，防水性防曬霜的防曬時間會大打折扣，所以最好每40分鐘重涂一次。

Sunbathing on the beach
沙灘日光浴

Scenario: Sunbathing gives us a healthy tan, but overexposure to the sun’s rays can do more harm than good to our skin.
適用情境：日光浴能為我們帶來健康的小麥色肌膚，然而，過度暴曬則弊大于利。

SPF requirement: 50 or more
防曬系數: ≥50

Solution: Keep in mind that you need the strongest sun protection you can get. Look for a thick sunscreen with an SPF of at least 50 that offers broad-spectrum protection. Or better still, a waterproof one that will give you longer-lasting protection. Don’t forget to reapply it every 60 minutes, or whenever you sweat or get wet.
防曬建議：這時候，你需要最強效的防曬保護：一層厚厚的防曬霜，其防曬指數不得低于50，并且要能抵擋所有波長的紫外線。當然，要想取得更好更持久的防護，你需要選擇具有防水功能的防曬霜。最后，別忘了每1個小時，或是每次你出了汗的時候都重涂一次防曬。