harmful substance短语¹⁴⁴⁹⁷²⁺² 基本例句 有害物质 The food items contained in the containers and packaging materials that are dirty or contaminated by pesticides, chemical fertilizers and other toxic and harmful substance; 使用污秽不洁或者被农药、化肥等有毒有害物污染的容器、包装材料盛装的食品； eeso