A dark red stain was spreading across his shirt.

一个暗红色的污渍正在他的衬衫上渗开。

《柯林斯英汉双解大词典》

A NASA image, rendered Feb. 7, shows a large plume of smoke spreading southward from fires, outlined in red, burning west of Churchill in Victoria's Gippsland region.

图为国家航空和宇宙航行局2月7日提供的照片，图片显示维多利亚州吉普斯兰地区Churchill西部的大火(以红色标示)所散发的浓烟呈羽毛状向南方扩散。

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Though the switch hadn't touched her, her shoulder blades had been tangled with curving red lines like a bramble spreading its thorns.

尽管鞭子没有碰到她，可她的肩胛骨上却满是弯弯曲曲的红色鞭痕，就好像一枝树莓在播散它的荆棘。

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Around the fourth day of the illness, a rash - flat red or brown blotches - may appear, usually starting on the forehead and spreading downwards.

BBC: Q&A: Measles and MMR