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

通常八至十二小时后，那些部位会变色浮现瘀痕，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.

为" livor mortis" ，它就是 部分你会有那么黑暗原因你在电视上看到紫色。