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1、maintain
维持;保持
The Department maintains many close contacts with the chemical industry.
这个部门与化工行业保持着众多密切的联系。
Push yourself to make friends and to maintain the friendships.
要求自己与人交友并保持友谊。
断言;宣称;坚称
He has maintained that the money was donated for international purposes.
他坚称这笔捐款将用于国际用途。
Prosecutors maintain no deal was made.
原告坚持说不存在任何交易。
保持，维持（在某一比率或水平上）
The government was right to maintain interest rates at a high level.
政府维持高利率的做法是正确的。
action is required to ensure standards are maintained at as high a level as possible.
要求采取行动确保标准维持在尽量高的水平上。
2、contribute
(为…)做贡献
The three sons also contribute to the family business.
这3个儿子也为家族事业做出了贡献。
I believe that each of us can contribute to the future of the world.
我相信我们每一个人都能够对世界的未来有所贡献。
促成;促使；是导致…的原因之一
The report says design faults in both the vessels contributed to the tragedy.
报告说两艘船存在的设计缺陷也促成了这场悲剧的发生。
Stress, both human and mechanical, may also be a contributing factor.
来自人的和机械方面的压力可能也是一个因素。
