| 单词 | particulate matter |
| 释义 | particulate matter (once / 168848 pages) n WORD FAMILY particulate matter USAGE EXAMPLESSuch advisories are issued when particulate matter levels are expected to exceed federal health standards for air quality. Washington Times(Dec 17, 2016) Environmental Protection Agency published new limits on fine particulate matter in January 2013. Washington Times(Dec 14, 2016) State officials say the cleaner-burning fuel will decrease children’s exposure to particulate matter and lower maintenance costs. Washington Times(Nov 30, 2016) n a small discrete mass of solid or liquid matter that remains individually dispersed in gas or liquid emissions (usually considered to be an atmospheric pollutant) Syn|Hypo|Hyper particulate dust fine powdery material such as dry earth or pollen that can be blown about in the air chalk dustdust resulting from writing with a piece of chalk fallout, radioactive dustthe radioactive particles that settle to the ground after a nuclear explosion material, stuff the tangible substance that goes into the makeup of a physical object |
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