n.

1. 有害的动物，害虫；有害的植物
   The severe frost killed off most of the insect pests.

   严霜杀死了大多数害虫。

2. 【口】讨厌的人；害人精；有害的东西
   That guy is a regular pest.

   那家伙是个十足的讨厌鬼。

n.

1. a destructive insect or other animal that attacks crops, food, or livestock.
2. informal an annoying person or thing.
3. (the pest) archaic bubonic plague.