In addition, the present status of implementation of the new chemical substance notification and its effects on chemical environmental management in China is given briefly.
文中还介绍了我国新化学物质申报审批制度的实施现状及其对化学品环境管理的影响。
We can get a new substance if we incorporate a chemical substance with others.
如果我们把一种化学物质和其他化学物质混合就能得到一种新物质。
A chemical change is one in which the structure of particles is changed and a new substance is formed.
化学变化是一种改变粒子结构、形成新物质的一种变化。
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