例句與造句

1. Since frictional vibration damages a mechanical system ’ s performances when the system works at a low velocity , efficient antifriction techniques are the key tasks that have been seeking after all along
   一個機械系統(tǒng)低速運行時,影響性能的一個重要問題就是摩擦振動的存在。學(xué)者們在不斷的探尋高效的潤滑技術(shù)來減小摩擦,實現(xiàn)機械系統(tǒng)的低速平滑運動。
2. It's difficult to find frictional vibration in a sentence. 用frictional vibration造句挺難的