There are two types of UV light that can harm your skin - UVA and UVB.

太阳光线中有两种紫外线会对你的皮肤造成伤害，即uva和uvb。

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After that, avoid midday sun, have children wear protective clothing and hats; seek shade; use sunglasses that block UVA and UVB; and use sunscreen.

之后，远离中午的阳光，让孩子穿防护衣和戴帽子，找荫凉地避暑，使用太阳镜阻止紫外线并且涂抹防晒霜。

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They should block 99-100% of the UVA and UVB radiation.

太阳镜应该阻挡99 - 100%的紫外线或的辐射。

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The UVA component is important as window panes at home or office or car often block UVB but not UVA rays.

WSJ: The Myths of Daily Sunscreen

Both UVA and UVB rays contribute to skin cancer, but the damage caused by UVA rays is harder to measure.

WSJ: European Sunscreen Roadblock on U.S. Beaches

New sunscreen labels in effect this year require a pass-fail test for UVA and UVB protection.

WSJ: European Sunscreen Roadblock on U.S. Beaches