磨损是造成机械零部件失效的主要原因之一。
Wear is one of the major causes of machinery parts' failures.
结果表明：组织疏松的存在是造成零件失效的主要原因。
The results showed that the existence of porosity was main reason of parts failure.
微动损伤普遍存在于紧密配合部件中，是造成零部件失效的主要祸患之一。
Fretting damage exists on tightly mating parts at large, which is one of the disaster reason making components and parts fail.
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