chemical
/ˈkemɪkl; `kɛmɪkl/ adj
1 of or relating to chemistry 化学的; 关於化学的
the chemical industry 化学工业.
2 produced by or using chemistry or chemicals 用化学方法或化学品产生的或生产的
a chemical experiment 化学实验
a chemical reaction, ie one causing changes in the structure of atoms or molecules 化学反应（造成原子或分子结构变化的反应）. chemical, n substance obtained by or used in a chemical process 在化学反应中得到的或使用的物质.