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。

youdao

As I opened the garage door, I startled a large moth, which, upon spreading it's wings, displayed a bright red "tail" hidden by the motley brown wings, more a "butterfly" than a moth.

当我打开车库大门的时候，我惊起了一只大飞蛾。当它伸展开翅膀时，可以看到一条鲜红色的“尾巴”隐藏在它那斑杂的棕色翅膀上。

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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