1. 我們使用哪種潤滑劑，主要取決于軸承的轉(zhuǎn)速如何。
   The sort of lubricant which we use depends largely on the running speed of the bearing.
2. 由于是固定的支承點，死頂尖必須潤滑。
   The dead center, being a stationary bearing point, must be lubricated.
3. 在鉆機的金剛鉆頭旋轉(zhuǎn)的時候，泥漿便進行了潤滑。
   As the diamond tip of the drill revolves, it is lubricated by mud.
4. 你再不加些潤滑油，發(fā)動機就要卡住了。
   Your engine will seize up if you don't put some more oil in.

潤的英語翻譯：

滑的英語翻譯：