maintain

汉语翻译：
vt. 维持, 维修, 保持, 坚持, 供养, 主张
【化】 维修词型变化：
动词过去式:maintained过去分词:maintained现在分词:maintaining第三人称单数:maintains形容词:maintainable名词:maintainability词意辨析：
assert, affirm, allege, maintain, testify, claim这些动词均含有“断言，声称”之意。
assert: 主观意味强，指自认为某事就是如此，而不管事实如何。
affirm: 侧重在作出断言时表现出的坚定与不可动摇的态度。
allege: 多指无真凭实据，不提供证据的断言或宣称。
maintain: 与assert近义，但前者指坚决维护某种主张或观点。
testify: 多指在法庭作证，庄严地宣称自己所说属实。
claim: 可与assert换用，但语气弱一些，侧重指行使自己的权利提出要求令他人承认。maintain, conserve, preserve, save, store这些动词均有“保存、储藏”之意。
maintain: 指保持原样，不增不减
conserve: 较正式用词，指小心地使用难以补充的资源或贵重物，免遭浪费或毁坏，以备不时之需。
preserve: 侧重将物品完好无损地保存下来。
save: 普通用词，指尽量少用，以争取数量上有所增加。
store: 普通用词，指将物品存放，以备将来使用。英语解释：
动词 maintain:

keep in a certain state, position, or activity; e.g., "keep clean"同义词：keep, hold

keep in safety and protect from harm, decay, loss, or destruction同义词：conserve, preserve, keep up

supply with necessities and support同义词：sustain, keep

state categorically同义词：assert, asseverate

have and exercise同义词：wield, exert

maintain for use and service同义词：keep

maintain by writing regular records同义词：keep

state or assert同义词：defend

support against an opponent同义词：uphold

observe correctly or closely同义词：observe, keep

例句：

Mankind have been trying every means to maintain the balance of nature.人类采用一切手段保持生态平衡。

We must maintain a firm attitude.我们必须采取坚定的态度。

The government has taken a measure to maintain the stability of prices.政府已经采取了措施以确保物价稳定。

Mindful of the need to maintain efficient communication, the board of directors decided to construct a new communication network.董事会注意到维持有效通讯的需要，因此决定建立一个新的通信网。

In order to maintain physical well being, a person should eat wholesome food and get sufficient exercise.为了维持身体健康，一个人应该吃有益健康的食品，并经常锻炼身体。

The car has to be constantly maintained.汽车必须经常保养。

He is too poor to maintain his family.他太穷了，无法养活家人。

Part of my job is to maintain good relationship with our suppliers.我的部分工作是同我们的供应商保持良好的关系。

详细解释：
main.tain
v.tr.（及物动词）
main.tained,main.tain.ing,main.tains
To keep up or carry on; continue:
维持或保持；继续：
例句：
maintain good relations.
维持良好的关系
To keep in an existing state; preserve or retain:
保持存在的状态；坚持或保持：
例句：
maintain one`s composure.
保持冷静
To keep in a condition of good repair or efficiency:
保养：使…保持在良好的修缮和效率状态中：
例句：
maintain two cars.
保养两辆小汽车
To provide for; support:
扶养；支持：
例句：
maintain a family.
供养家庭
To keep in existence; sustain:
使存在；支撑：
例句：
enough food to maintain life.
足够维持生命的食物
To defend or hold against criticism or attack:
保卫或抵制批评或进攻：
例句：
maintained his stand on taxes.
维护他在税收上的立场
To ｄｅｃｌａｒｅ to be true; affirm:
断言；主张：
例句：
maintained her innocence.
坚持她的清白无辜
来源：
Middle English maintainen
中古英语 maintainen
from Old French maintenir
源自 古法语 maintenir
from Medieval Latin manutenôre
源自 中世纪拉丁语 manutenôre
from Latin manô tenôre [to hold in the hand]
源自 拉丁语 manô tenôre [拿在手中]
manô [ablative of] manus [hand] * see man- 2
manô [] manus的夺格 [手] *参见 man- 2
tenôre [to hold] * see ten-
tenôre [坚持] *参见 ten-
【引伸】
maintain.abil.ity
n.（名词）
maintain.able
adj.（形容词）
maintain.er
n.（名词）