晨昏定省: salute one's parents in the morning and at night; attend to one's parents' comfort on getting up and going to bed; see one's parents to bed and greet them in the morning
This is one of a series of images designed to look for landforms near europa ' s terminator - the line dividing day and night - where low sun angles highlight subtle topographic features 这是一系列被设计用来观察木卫二晨昏线附近地貌的图片中的一幅，晨昏线是分隔白天和夜晚的界限，那里阳光以低角度突出了精细的地貌。
