食人鱼在英语中称作 "piranha"。这个词来源于巴西的一种印第安语，意思是 "咬人的鱼"。

Piranhas are freshwater fish native to South America. They have a reputation for being aggressive and feeding on meat, including the flesh of other fish and animals. This reputation is largely undeserved, as piranhas are typically not aggressive towards humans and only attack when provoked or when competing for food.

例句：

Piranhas have razor-sharp teeth that they use to feed on meat.

Despite their reputation, piranhas are generally not aggressive towards humans.

Some people fear piranhas, but they are actually quite fascinating creatures.