When brake disc wears enough to affect safety in operation or can 't adjust clearance, this is called failure.
当制动盘磨损到影响安全操作或制动间隙无法调节时，即为失效。
Bearing in the work, because of external or internal factors, with the gap so that the original change, lowering the precision, and even lead to "killed" clearance changes as failure.
轴承在工作中，由于外界或内在因素的影响，使原有配合间隙改变，精度降低，乃至造成“咬死”称为游隙变化失效。
Method Renal-failure dogs were treated with regular hemodialysis and ultrasonic hemodialysis alternatively, the clearance of regular hemodialysis and ultrasonic hemodialysis were compared.
方法对肾衰竭实验犬进行血液透析，加超声透析与不加超声透析交替进行所得的数据进行比较。
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