The sky must be very dark for a moonbow to be watched clearly—any bright light can obscure it.
要想清楚地观察到月虹，天空必须非常黑暗——任何明亮的光线都可能使它模糊。
In the dim light squeezing through the door, she watched him startle.
借着从门缝透过来的微弱光线，她看见他吓了一跳。
Three years later a British physicist, Arthur Eddington, watched what happened to light from stars that were close in the sky to the sun during a solar eclipse.
三年后，一位英国物理学家Arthur Eddington在一次日食中观察到，天空中距离太阳近的恒星的光发生了变化。
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