1.maintain v. 维护，保养，维持
指经常维修机器、建筑物等，使其保持良好状态。
Which company is responsible for maintaining this equipment?
哪家公司负责维护这台设备？
The garden is large and difficult to maintain.
这个花园很大，难以养护。
She may not have the money to maintain or restore her property
她可能没有足够的钱来维护或修葺她的房产。
The house is large and difficult to maintain.
房子很大，难以养护。
The function they perform is to maintain the established order of society.
他们的职务是维护建立起来的社会秩序。
to maintain law and order/standards/a balance
维持治安；保持水平 / 平衡
The two countries have always maintained close relations.
这两个国家一直保持着密切关系。
They have maintained a close association with a college in the US.
他们和美国一所学院保持了密切联系。
The company has maintained trade contacts with India.
这家公司和印度一直保持着贸易往来。
The company maintains a high degree of liquidity.
公司保持着很高的资产折现度。
She maintained a dignified silence.
她一言不发，以保持尊严。
He maintained a professional demeanour throughout.
他始终保持着专业人才的风度。
Physical activity is an important factor in maintaining fitness.
进行体育活动是保持身体健康的一个重要因素。
The paper has proved unable to maintain its circulation figures.
事实证明这家报纸难以维持其发行量。
to maintain prices (= prevent them falling or rising)
维持价格的稳定
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。
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。
The authorities have said they will attempt to maintain essential services.
当局已表示他们将努力维持公共基础服务。
He maintained order by sheer force of personality.
他纯凭人格力量维护秩序。
The government struggled to maintain law and order.
政府努力维持治安。
We aim to maintain high standards of customer care.
我们的宗旨是始终以高标准为顾客服务。
...a tough campaign to force authorities to maintain roads properly...
迫使当局妥善维修道路的艰难斗争。
The UN is trying to maintain a dead zone between the warring groups.
联合国正试图在交战方之间保留隔离带。
2.conserve v. 保护，保存；节约；节省；保藏
较正式用词，通常指保护自然资源使其不发生改变或破坏。
We must conserve our land/natural resources for future generations.
我们必须为后代子孙保护土地/自然资源。
Some environmentalists urged that the government take effective measures to conserve the wildlife.
一些环保人士呼吁政府采取有效措施保护野生动物。
Afforestation conserves soil and water and also checks drift sand.
造林可以保持水土，同时也可以制止流沙。
Some environmentalists urged that the government take effective measures to conserve the wildlife.
一些环保人士呼吁政府采取有效措施保护野生动物。
Help to conserve energy by insulating your home.
对房屋做隔热处理来帮助节约能源。
It is important to conserve energy.
节能十分重要。
We should conserve oil and gas by making full use of other energy sources
我们应该通过充分利用其他能源来节省石油和天然气。
3.preserve v. 保护，保存（维持现状）
指将某物完好地保存，通常用被动语态。
The city council spent a lot of money to preserve the old castle.
市政委员会花了不少钱来保护那座古城堡。
The society was set up to preserve endangered species from extinction.
成立这个协会是为了保护濒危物种不致灭绝。
Conservationists are mostly wedded to preserving diversity in nature.
自然环境保护主义者大多致力于保持物种的多样性。
We need to preserve the forest.
我们需要保护森林。
This bowl has been preserved intact.
这个碗保存得完好无损。
This vase has been preserved intact.
这个花瓶保存得完好无损。
The body was found to be well preserved, his features easily recognizable
尸体保存完好，他的容貌特征清晰可辨。
The house from 15th century has been perfectly preserved.
这座建于15世纪的宅第保存完好。
He was anxious to preserve his reputation.
他急于维护自己的名声。
She says the sovereignty of the Crown must be preserved.
她说必须维护王国政府的主权。
The only way to preserve democracy is to raise hell about its shortcomings.
维护民主的唯一办法是对其缺陷大声提出意见。
It's difficult to preserve your dignity when you have no job and no home.
一个无家无业的人难以保持自己的尊严。
Their main job is to preserve health rather than treat illness
它们的主要功效是保健而非治病。
Efforts to preserve the peace have failed.
维护和平的努力失败了。
We will do everything to preserve peace.
我们会尽全力维持和平。
We need to preserve the element of surprise.
我们得保留一些使人感到意外的东西。
The resort still preserves a feeling of exclusivity.
这个度假胜地仍然保持着极少部分人专享的情调。
Their music has been preserved for posterity.
他们的音乐已为后世保存起来。
All kinds of traditional craft industries are preserved here.
这里保留着各种各样的传统手工业。
Freezing isn't a bad way of preserving food
冷冻不失为一种保存食物的好方法。
Protective measures are necessary if the city's monuments are to be preserved.
要保存城市古迹必须采取一些维护性措施。
4, store 储藏，储备；把…存入仓库，存放；（在计算机里）存贮；供应，供给；记忆；容纳, 装得下；装满
Store the cookies in an airtight tin...
把饼干贮存在一个密封罐里。
He hoped the electronic equipment was safely stored away.
他希望那些电子设备得到妥善保存。
Thousands of pieces of data are stored in a computer's memory.
在计算机的存储器中存有成千上万条数据。
Information must be stored so that it is secure from accidental deletion.
必须把资料保存起来，这样才不至于无意中删除。
One major difference between these computers concerns the way in which they store information.
这些计算机之间的一个主要差异涉及其储存信息的方式。
The server is designed to store huge amounts of data.
该服务器是为存储大量数据设计的。
He simply stored the tapes away...
他只是将磁带存放起来。
He's stored away nearly one ton of potatoes.
他已经储备了近 1 吨马铃薯。