单词	relative roughness
释义	relative roughness 对粗糙度
随便看	train resistance formula train ring network train route train route indicator train running train running delay train running in train running indicator train running in opposite direction train running in reverse direction train running on scheduled time train running out train running time on load trains train safety regulation train-scent train schedule train schedule chart trains command train section train separating train separation train service train service plan trainset 无人到无人尽日花飞雪无人惜无人收废帐无人收拾理则那无人无牛不及犁无人深巷无人独舞无人知所去无人知是荔枝来风疙瘩风疹风疹块风痧风痫风痰风痱风痹风瘫风癣