Conservationists in South Africa are infusing a special red dye into the horns of live rhinos.

南非环保人士将一种特殊的红色染料注入活犀牛的角中。

The other is a brain scan called PET that uses a special dye to highlight clumps of amyloid in your brain.

另一种是名为PET的脑部扫描，用一种特殊染液突出脑内的淀粉样蛋白团块。

To that end, they have been tagged with a special radioactive dye commonly used in medicine to track things around the body.

为此，研究人员在红细胞上涂上了一种特殊的放射性染料作为标签，这种染料在医学上通常用于跟踪人体的物质。