词根:rod, ros = bite, 表示“咬”
rodent n. "啮齿动物(rao+ent,咬东西的动物)"
rodenticide n. 灭鼠药(rodent+icide杀→杀啮齿动物)
corrode v. 腐蚀,侵蚀(cor全部+rode咬→全部咬掉→腐蚀)
corrosive a. 腐蚀性的(cor+ros+ive)
corrosion n. 腐蚀(cor+ros+ion)
erode v. 侵蚀(e出+rode→咬出去→[水上]侵蚀掉)
erosion n. 侵蚀,腐蚀(e+ros+ion)