The most effective sunscreens protect against both UVA and UVB rays. They work by either chemically absorbing UV rays or deflecting and bouncing them off your body.

• 最有效的防晒霜既能防护紫外线A也能防护紫外线B。它们的工作原理要么是含有能吸收紫外线的化学物质，要么是使紫外线折射或色散，避开你的身体。