RAMMING of ballast under railway sleepers_专利英汉词典
RAMMING of ballast under railway sleepers
[专利英汉词典]
RAMMING of ballast under railway sleepers【固定建筑物】
铁路枕木的道砟压实
是什么意思，RAMMING of ballast under railway sleepers的解释，RAMMING of ballast under railway sleepers的翻译
