1、preserve

保持，维持（原状）

We will do everything to preserve peace.

我们会尽全力维持和平。

an effort to fit in more students while preserving standards.

在保持原有教学水平的同时招收更多学生的努力

保护；保存；维护

We need to preserve the forest.

我们需要保护森林。

Conservation is an issue which gets a lot of attention these days — whether it means preserving old buildings, or protecting the environment.

资源保护是目前备受关注的问题——不管它指的是对古建筑的保护，还是对环境的保护。

专属工作；独占的活动领域

The conduct of foreign policy is largely the preserve of the president.

外交政策事宜主要由总统专门负责。

With the menfolk away at war, women got their first crack at the male preserves of employment and sport.

由于男人们都去了战场，女人们第一次在男性专属的职业和运动中一展身手。

2、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。

供养;赡养

He should pay and maintain you as well.

他得给你钱，还得供养你。

the basic costs of maintaining a child.

抚养一个孩子的基本费用