Of course, if you've seen one elderly Asian sheepshead wrasse, you've seen them all.

当然，如果见过一只年老羊濑，见过所有了。

One good sign of health for our oceans is the mere existence of older fish, like this Asian sheepshead wrasse in the China Sea.

海洋健康一个征兆是较老存在，譬如说这只在中国海羊濑。