maintain /meinˈtein/ vt. 1.保持,维持:Food is necessary to maintain life. 食物对维持生命很有必要。 2. 赡养,负担:maintain a wife and five children 养活妻子和五个孩子;maintain oneself 自立 3. 维护,保养:maintain a road养路;maintain houses 维修房子 4. 坚持,主张:He maintained that he was not to blame. 他坚持说他是无罪的。

[辨析]maintain指小心维护机器、设备等,以保持良好的状态;也可用于抽象事物如保持健康、友谊等。如:maintain the new machine (friendship) sustain指保持事物原状或支撑某物;也可指精神上和体力上的支持,着重指可以维持一段时间的支持。如:An old wall cannot sustain a new building. He was sustained during his illness by hope.

 maintenance /ˈmeintinəns/ n. 1. 维持,保持: maintenance of friendly relations 保持友好关系; law maintenance 法律的维护 2. 维修,保养;file maintenance 文件管理;vehicle maintenance 车辆的保养;building maintenance 房屋维修;cost of maintenance 维修费