n. material produced by or used in a reaction involving changes in atoms or molecules
a. relating to or used in chemistry
a. of or made from or using substances produced by or used in reactions involving atomic or molecular changes
n. 化学药品
a. 化学的, 化学上用的
1. The chemical reaction produced a lot of heat.
这个化学反应产生了大量的热量。
2. She studied chemical engineering in college.
她在大学学习化学工程。
3. Many cleaning products contain harmful chemicals.
许多清洁产品含有有害的化学物质。