Evolution of chemical matter and its level classification are not two irrelevant problems but two aspects of a problem.

化学物质的进化和化学物质的层次分类，是一个问题的两方面，而不是两个不相关的问题。

youdao

Whit- en Products were maximal among cosmetics, possessed 57.4 percent, while dye-hairs and bum-hairs were made almost from chemical matter.

天然化妆品又以祛斑为最多，占57．4％，而染发、烫发类化妆品多以化学性物质为原料。

youdao

The result of the laboratory analysis of the lacustrine chemical sediment samples from Dongdagou in the Datong Basin shows that the chemical matter is a hydromagnesite.

大同盆地东大沟湖成化学沉积物样品的实验室分析结果表明，该化学物质是水菱镁矿。

youdao

Later, McCain said the reported use of chemical weapons was only a matter of time.

CNN: SHARE THIS

Devices are already available on the commercial market that can manufacture lethal chemical agents (and, for that matter, toxin and biological weapons) without specialized or dedicated facilities.

CENTERFORSECURITYPOLICY: Center for Security Policy | Submitted Testimony Of Frank J. Gaffney, Jr. Before A Joint Hearing Of The Senate Governmental Affairs Committee And The Permanent Subcommittee On Investigations

Most of these deaths occur in developing countries where larger amounts of harmful chemical compounds such as toxic gases and particulate matter are released in the atmosphere.

UNESCO: 2015 For Women In Science Fellows