“化学”造句
有机食品是未使用人工
化学制剂和杀虫剂的纯净食品。
Organic food is unadulterated food produced without artificial chemicals or pesticides.
《牛津
化学初级读本》丛书旨在论述有机
化学中的重要问题。
The Oxford Chemistry Primers aim to cover important topics in organic chemistry.
硝酸盐是水和土壤中自然存在的
化学物质。
Nitrates are chemicals that occur naturally in water and the soil.