premature gear failure

齿轮损坏... ... ) damaged tooth 损坏的(齿轮)齿 ) premature gear failure 齿轮过早损坏 ) damaged timing gear 损坏的正时齿轮 ...

... premature bit failure1. 钻头过早磨损 premature gear failure1. 齿轮过早损坯 premature oarian failure1. 卵巢早衰 ...