maintain的过去式是什么

1. 坚持
2. 养护
3. 保因
4. 定克混剂
5. 维护

1. 保持，维持，使继续
2. 保养，维护，维修
3. 坚持，主张，断言
4. 供养，供给，抚养，赡养
5. 支持
6. 负担
7. 保卫
8. 坚守
9. 强调
10. 坚持意见，固执己见
11. 继续，持续

1. keep in a certain state, position, or activity; e.g.,

   "keep clean"
   "hold in place"
   "She always held herself as a lady"
   "The students keep me on my toes"
   

2. keep in safety and protect from harm, decay, loss, or destruction;

   "We preserve these archeological findings"
   "The old lady could not keep up the building"
   "children must be taught to conserve our national heritage"
   "The museum curator conserved the ancient manuscripts"
   

3. supply with necessities and support;

   "She alone sustained her family"
   "The money will sustain our good cause"
   "There's little to earn and many to keep"
   

4. state categorically
5. have and exercise;

   "wield power and authority"
   

6. maintain for use and service;

   "I keep a car in the countryside"
   "She keeps an apartment in Paris for her shopping trips"
   

7. maintain by writing regular records;

   "keep a diary"
   "maintain a record"
   "keep notes"
   

8. state or assert;

   "He maintained his innocence"
   

9. support against an opponent;

   "The appellate court upheld the verdict"
   

10. stick to correctly or closely;

    "The pianist kept time with the metronome"
    "keep count"
    "I cannot keep track of all my employees"
    

1.维持;保持
If youmaintain something, you continue to have it, and do not let it stop or grow weaker.

e.g. 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。
e.g. Push yourself to make friends and tomaintain the friendships.
要求自己与人交友并保持友谊。

2.断言;宣称;坚称
If you say that someonemaintains that something is true, you mean that they have stated their opinion strongly but not everyone agrees with them or believes them.

e.g. 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。
e.g. Prosecutorsmaintain no deal was made...
原告坚持说不存在任何交易。

3.保持，维持（在某一比率或水平上）
If youmaintain somethingat a particular rate or level, you keep it at that rate or level.

e.g. The government was right tomaintain interest rates at a high level.
政府维持高利率的做法是正确的。
e.g. ...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。

4.维修;保养
If youmaintain a road, building, vehicle, or machine, you keep it in good condition by regularly checking it and repairing it when necessary.

e.g. ...a tough campaign to force authorities tomaintain roads properly...
迫使当局妥善维修道路的艰难斗争
e.g. The house costs a fortune tomaintain...
维修这幢房子花销不菲。

5.供养;赡养
If youmaintain someone, you provide them with money and other things that they need.

e.g. He should pay andmaintain you as well.
他得给你钱，还得供养你。
e.g. ...the basic costs of maintaining a child.
抚养一个孩子的基本费用

maintain at (v.+prep.)

把…保持在 keep sth at a (higher) level
maintain sth at sth

We must do our best to maintain sales at their usual rate in these times of poor trade.

在生意不景气的时候,我们要尽力使销售额保持在平日的水平上。

maintain in (v.+prep.)

供养…使之以…生活 support sb in sth

maintain on (v.+prep.)

依靠…供养 support sb on sth
maintain sb on sth

He has to maintain a large family on a small salary.

他不得不依靠很少的工资养活一家人。

maintain with (v.+prep.)

与…保持 retain with sb
maintain sth with sb

We maintain cordial relations with our neighbours.

我们与邻里保持亲切友好的关系。

• Let ours also learne to maintaine good workes..that they be not unfruitfull.

  出自：Bible (AV): Titus

• ☆ 13世纪中期进入英语，直接源自盎格鲁法语的meintenir；最初源自拉丁语的manu tenere：manu (手） + tenere (握着，拿着），意为用手拿着。