而类似甲壳虫和螽斯这样的昆虫，会在被攻击的时候使自己流血。但是这些极端措施的效果如何还并不为人所知。

A few insect species including beetles and katydids actively bleed when attacked, but the benefits of taking such extreme measures were not clear.

youdao

自我伤害是通过故意造成刮痕或用利器割伤自己，以破坏皮肤，使之流血。这称之为切割。

Injuring yourself on purpose by making scratches or cuts on your body with a sharp object - enough to break the skin and make it bleed - is called cutting.

youdao

如果你想突出唇型，是嘴唇不再流血，你可以用一只和你的唇色一样的唇线笔，用软纸轻按唇线，使之柔和。

If you want to enhance your mouth shape and to keep the gloss from bleeding, use a lip liner in the same color as your lips. Smudge the line to soften the edge.

youdao

First, hopefully your blood clots and so that stops you from dying from loss of blood there, but your body tries to heal this wound that's created.

首先,顺利的话血液会形成凝块,使你不至于流血而死,进而身体尝试着去愈合创口

耶鲁公开课 - 生物医学工程探索课程节选