hazard substance

基本解释

Chemical hazard: refers to the content of a chemical substance in more than the normal level and on human health hazards.
化學性危險：指食品中化學物質的含量超過正常水平竝對人類健康有危害。
Results The proportion in senior students was higher than in junior students for the students who knew that there was hazard substance in cigarette.
結果高二組學生對於菸草中含有的有害物質知曉率高於初二組；
The nation has established the identification standard of major hazards, and the identification basis is the quantity of hazard substance. The standard is mainly used in the chemical plant.
國家已經制定了重大危險源辨識標準，辨識依據是危險物質的數量，主要適用於化工行業。