For example, this feather has no blue pigments in it.

例如，这片羽毛当中并没有蓝色色素。

Then, you could grind them up to get some blue pigment!

然后你可以将它们碾碎并得到蓝色色素！

This is because there's no blue pigment in these butterflies.

这是因为这些蝴蝶中没有蓝色色素。

This is because there's no blue pigment in these butterflies... Wait… so they're blue, but they're not really blue?

这是因为这些蝴蝶中没有蓝色色素，等等，.所以它们是蓝色的，但它们并不是真正的蓝色？

No vertebrate, not a single bird or mammal or reptile that we know of, makes a blue pigment on its body.

我们所知道的任何脊椎动物、鸟类、哺乳动物或爬行动物体内会制造蓝色色素。