为自己加油

Correct or improve the translation of the following English sentences.原文：The oil must be of the correct thickness; if it is too thin it will not give sufficient lubrication, and if it is too thick it will not reach all parts that must be lubricated. 译文：润滑油的浓度必须正确，如果它太稀它将起不到应有的润滑作用，如果它太稠它将流不到所有需要润滑的零件上去。改译：

润滑油的浓度必须得当，太稀则起不到应有的润滑作用，太稠则流不到所有需要润滑的部件上去。