An analogy that applies to levels of abstraction is that of a black-box view (a higher level that does not show implementation details) and a white-box view (an inside look at how things work).
与抽象级别类似的是黑箱视图(不显示实现细节的较高级别)和白箱视图(显示事物工作方式的内部视图)。
2
The photo presented below, although in black and white, is both extremely sharp and clear. To achieve such level of clarity in black and white is extremely hard.
虽然只是黑白照片，但是却非常鲜明锐利，将黑白照片拍摄到如此程度是相当不容易的。
3
The rich level of the courtyard, on the other hand, simplifies the facade of the building, which is similar to the traditional Chinese ink painting where black, white and grey are chosen naturally.