How many boys and girls are there in your class?

to maintain law and order/standards/a balance

维持治安；保持水平 / 平衡

...the basic costs of maintaining a child.

抚养一个孩子的基本费用

to maintain prices (= prevent them falling or rising)

维持价格的稳定

...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 company is responsible for maintaining public telephone boxes.

这家公司负责维护公共电话亭。

Careers Officers maintain contact with young people when they have left school.

年轻人离开学校以后,职业指导员和他们保持联系。

Push yourself to make friends and to maintain the friendships.

要求自己与人交友并保持友谊。

...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。

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。

(formal)She maintained a dignified silence.

她一言不发，以保持尊严。

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。

He should pay and maintain you as well.

他得给你钱，还得供养你。

The hotel prides itself on maintaining high standards.

这家酒店以保持高标准而自豪。

The report found that safety equipment had been very poorly maintained.

报告说安全设备保养得很差。

How can we maintain control of spending?

我们如何保持对开支的控制？

The house costs a fortune to maintain...

维修这幢房子花销不菲。

She has always maintained her innocence .

她一直坚持说她是无辜的。

This is the most efficient way to build up and maintain a reasonable level of physical fitness.

要让身体达到一定的健康水平并保持下去,这是最有效的办法。

How can you maintain a family on $900 a month?

每月900美元怎么能维持一家人的生活？

Her income was barely enough to maintain one child, let alone three.

她的收入养活一个孩子几乎都不够，更不用说三个了。