These are prime hours for exposure to skin-damaging ultraviolet (UV) radiation from the sun, even on overcast days.

这段时间是皮肤受到太阳紫外线照射伤害的主要时段，即使是阴天也是如此。

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Hours later, the prime minister set the August 30 date.

VOA: standard.2009.07.13

This market targets listeners during prime commuting hours.

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And there are strict quotas on imported shows--during prime-time hours only 15% of programming can be imported.

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While NBC trails its competitors in the prime-time hours, "Today" has ranked No. 1 in mornings each week for more than 15 consecutive years.

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