当标题分组很重要时，将其设计成有颜色或有阴影的。
Guideline 4 - Use coloured or shaded grouping headers ONLY if they are important.
成林迅速的梧桐为南京炙热的夏天提供了令人舒爽的阴影。
The trees grew fast and provided shade during Nanjing's scorching summers.
约翰逊与其他警务人员成扇形展开，排成一列横队进行搜索。明亮的探照灯扫照地面，投射出的阴影，照得周围的灌木丛摇曳不定，阴森可怖。
Johnson and the others fanned out and formed a line. Their heavy flashlights swept over the ground, casting eerie shadows that made the brush appear to sway.
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