railway classification yard造句

"railway classification yard"是什么意思

造句与例句手机版

He also invented the " Dowty retarder " for use in railway classification yards, a hydraulic device that regulates the speed of rail cars as they roll down an inclined track.
It's difficult to see railway classification yard in a sentence. 用railway classification yard造句挺难的

相邻词汇

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