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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、evolve
进化；演变
The bright plumage of many male birds has evolved to attract females.
很多雄鸟进化出鲜艳的羽毛是为了吸引雌鸟。
Maize evolved from a wild grass in Mexico.
玉米是从墨西哥的一种野生禾本植物进化而来的。
（使）逐步发展;（使）演化
a tiny airline which eventually evolved into Pakistan International Airlines.
最终发展成巴基斯坦国际航空公司的一家小型航空公司
Popular music evolved from folk songs.
流行音乐从民歌演变而来。
