常見例句雙語例句The stability of dam abutment should has a direct relation to failure-free operation and security of projects, and security of downstream people's life and property as well.壩肩巖體的穩(wěn)定與否，將直接關(guān)系到工程的正常運行和安全，以及下游人民生命財產(chǎn)的安全。Their electronically commutated brushless DC motor provides virtually maintenance-free operation over time by eliminating brush maintenance and associated brush motor failure.其電子換向直流無刷電機(jī)通過排除刷子維護(hù)和關(guān)聯(lián)電機(jī)的出錯，在操作過程中提供免維護(hù)操作。 返回 failure-free operation