This can be a useful technique for seeing faint " nebulosity " - it ' s often a lot easier to see such nebulosity as faint shading against a white background rather than as " not quite black " against a black background 这个选项对于看暗星云是十分有用的-暗星体显示在亮背景上比“不是非常黑”的暗星体显示在黑背景上要容易观察的多。
2.
Under the thatched roofs her mind s eye beheld relaxed tendons and flaccid muscles , spread out in the darkness beneath coverlets made of little purple patchwork squares , and undergoing a bracing process at the hands of sleep for renewed labour on the morrow , as soon as a hint of pink nebulosity appeared on hambledon hill 在苔丝的想象里，她看见茅屋里的人，肌腱松弛了，肌肉放松了，躺在黑暗的屋顶下，盖着小紫花格子的被子，正在蓄积体力，等到第二天早晨汉姆布莱顿的山顶刚染上朝霞，他们就要起来从事新的一天的劳动了。
3.
When she came close and looked in she beheld indistinct forms racing up and down to the figure of the dance , the silence of their footfalls arising from their being overshoe in scroff - that is to say , the powdery residuum from the storage of peat and other products , the stirring of which by their turbulent feet created the nebulosity that involved the scene 她走到屋前往里一看，看见一群模糊的人影正按照跳舞的队形来回奔跑着，然而他们跳舞的脚步却没有声音，因为他们脚底下铺的是一层软垫也就是说，铺了一层堆放土煤和其它产品的煤粉草渣，经过他们混乱脚步的搅动，就扬起一片烟云，笼罩了整个场地。
