3.a soft gray malleable metallic element that resembles tin but discolors on exposure to air;it is highly toxic and is used in rodent and insect poisons;occurs in zinc blende and some iron ores.

• 一种软且可延展的灰色金属元素，类似锡，但暴露于空气中会退色，有剧毒，用于制啮齿动物和昆虫毒药，见于闪锌矿和一些铁矿石中。