Two sources of illumination must differ by between 5 to 10% to be detected.
两个照明源必须相差 5% 到 10% 才能被检测到。
The one tiny window was the only source of illumination, and the light that came in fell on a family of five.
那一扇小小的窗户是唯一的照明源,射进来的光落在一家五口的身上。
Households that could not afford really nice sources of illumination would use lamps that burned the oil from baleen whales, which wasn't as nice.
买不起优质照明源的家庭会使用燃烧须鲸油的灯,但效果不太好。
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