如果我想以白盒方式验证这段代码，就必须将特定于用户界面的代码与业务代码分开，这就需要进行重构。

If I want to validate this code in a white box manner, I have to separate UI-specific code from business code, which requires some refactoring.

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公园边界以白线标出。

Park boundaries are outlined in white.

youdao

传统绘画以白为背景，以黑为主角，现代绘画可以尝试角色互换。

In traditional painting, black is the main character against the white background, while in modern painting they could interchange their positions.

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