I am quite sure a stinging nettle is of no use in the world.

我确信荨麻是世上的一种无用之物。

Some protect against plant-eating animals by secreting itchy toxins from the leaf or stem epidermis, which, if you've ever run into a stinging nettle, you are already painfully familiar with.

有些植物通过从叶子或茎表皮分泌令人发痒的毒素来保护自己免受食草动物的侵害，如果你曾经遇到过荨麻，那么你就已经对这种毒素很熟悉了。

I like going for hikes And stinging nettles became a reality one day when I walked through them and let me tell you That hurts and it hurts for a long time.

我喜欢去远足 有一天，当我走过荨麻时，荨麻变成了现实，让我告诉你，这很痛，而且会痛很长时间。