conserve
单词辨析：
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。
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。
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。
This bowl has been preserved intact.
这个碗保存得完好无损。
The house from 15th century has been perfectly preserved.
这座建于15世纪的宅第保存完好。
相关例句：
China must protect the environment and conserve nonrenewable resources.
中国必须保护环境，保存不可再生资源。
Participation. I have to conserve strength and store up energy.
重在参与嘛，我得养精蓄锐。
That's the only way that nature can conserve momentum.
这是唯一的方法，自然使动量守恒之道。
They had to conserve the candles now with winter upon them.
冬天眼看就要到了，他们不得不把蜡烛省着用。
We must conserve water during the drought.
在干旱期间我们必须谨慎用水。
New laws to conserve wild life in the area have been publish.
为保护该地区野生动物而颁布了新法律。