昼光是指太阳在地球表面产生的可见辐射。它包括了直射日光和天空漫射光两部分。昼光是人类及其它生物赖以生存的天然光源。
... 1．7 天空（漫射）光 skylight 1．8 昼光 daylight 1．9 反射（总）日辐射 reflected（global）solar radiation ...
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探测设备包括昼光摄像机、红外热像仪、伺服转台和控制机柜。
The detecting equipment composes of the TV camera, the thermal infrared imager, the servo turntable and the control cabinet.
就把光暗分开了，神称光为昼，称暗为夜。
And God called the light day and the darkness he called night.
太阳冉冉地升上天空，他们知道是大白天了，因为海的颜色由暗蓝变成了碧绿，上面还夹带着琥珀色的光道，而那浪花好似滚滚白雪。夜去昼来的过程，他们并不知晓。他们只是从滚滚而来的浪涛的颜色上察觉到这番变化。
The sun swung steadily up the sky, and they knew it was broad day because the color of the sea changed from slate to emerald-green, streaked with amber lights, and the foam was like tumbling snow.
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