Pests are insects or small animals that damage crops or food supplies. 害虫; 有害的小动物
noun [集合/集体]害虫,有害动物;<非正式>讨厌的人(或物)
You can describe someone, especially a child, as a pest if they keep bothering you. 讨厌鬼 (尤指小孩) • He climbed on the table, pulled my hair, and was generally a pest.