为此,东京动物园的饲养员们收集了犀牛的“汗水”,交给科学家们。经过研究,科学家们发现了两种化学物质导致了犀牛的汗呈现出桔红色。

• Zoo keepers in Tokyo collected the "hippo sweat" and passed it on to the scientists. They analyzed it and found two chemicals that colour the liquid.