rock duster
/ˈrɒk ˌdʌstə/North American Mining
noun
A machine which spreads pulverized rock around a coal mine in order to reduce the risk of coal-dust explosions.
Origin
1930s; earliest use found in U.S. Patents. From rock dust + -er.
| 单词 | rock duster |
| 释义 | rock duster/ˈrɒk ˌdʌstə/North American Mining noun A machine which spreads pulverized rock around a coal mine in order to reduce the risk of coal-dust explosions. Origin |
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