“pit prop”例句

单词 pit prop
例句 DEFINITIVE EXAMPLES 权威例句〔SUPPORT〕The pit props were placed only a foot or two apart, to support a mile of rock above them. 矿井里每隔一两英尺就有一根支柱,用来支撑上面一英里厚的岩石。朗文写作活用

 

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