四害 Traditional form: 四害 Pinyin (reading): sìhài Definitions: "the four pests", i.e. rats, flies, mosquitoes, and sparrows see also 打麻雀運動/打麻雀运动 ( Dǎ Máquè Yùndòng) Characters: 四 - four 害 - to injure, to harm; to destroy, to kill Traditional characters: 四 - four 害 - to injure, to harm; to destroy, to kill