国家气象局(NWS)提醒道，它给出的炎热指数值并不可靠，微风条件和暴露于阳光直射下都能增加炎热指数15度。
The NWS cautions that its given heat index values assume shady, light wind conditions and that exposure to direct sunlight can increase the heat index by 15 degrees.
长期以来，研究植物的科学家采用卫星测量植被的新鲜指数，即观测植物反射阳光值，预测植物的状态。 植物新鲜指数的变化是季节性的。
Scientists who study plants and trees from space have long relied on satellite-derived measures of “greenness”—that is, observations of the amount of sunlight reflected by vegetation.
但是，如果你每天服用的话，那么你需要提升你的防晒指数了，因为这种提取物对引起严重的阳光反应。
However, if you take it every day, you'll need to start amping up your SPF, as this herb has been linked to severe sun reactions.
随着离开太阳的距离增加，阳光强度呈指数级下降，因此一颗距离太阳比地球近一倍的行星所接受到的阳光远远不止地球所接受到强度的一倍。
Light falls off exponentially with distance, so a planet that is, say, twice as close to the sun as Earth is would get much more than twice the solar energy.
划船指数适宜白天天气晴朗，阳光明媚，适宜划船或嬉玩各种水上运动。
Delimits the ship index to be suitable the daytime weather sunny, the sunlight is beautiful, is suitable delimits the ship or plays plays each kind of aquatic sports.
划船指数适宜白天天气晴朗，阳光明媚，适宜划船或嬉玩各种水上运动。
Delimits the ship index to be suitable the daytime weather sunny, the sunlight is beautiful, is suitable delimits the ship or plays plays each kind of aquatic sports.
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