This indicates a hydrodynamic condition with a very marked potentiometric gradient.这说明水动力条件具有很明显的位能梯度.In metal lubrication two distinct regions are recognized: boundary and hydrodynamic.在金属的润滑作用中存在两个不同区段: 边界和流体区.Falling ...
这笔贷款要在20年内还清。The loan is repayable over twenty years.这笔借款要在年底还清。The loan is due for repayment by the end of the year.这位老人终于还清了所有的欠款.The old man has at last wiped off all his debts....