Usually eight to twelve hours later, the skin in those areas is discolored by livor mortis, or post-mortem stain.

通常八小时后，那些部位的皮肤变色浮现瘀痕，或为尸斑。

This is called " livor mortis" and it's the reason parts of you will have that dark purple color you have seen on TV.

这被为" livor mortis" ，它就是 部分有那么黑暗的原因在电视上看到的紫色。