maintain

It is important to maintain a healthy diet and exercise regularly as you get older.

(Chinese) 随着年龄增长，保持健康的饮食并定期锻炼非常重要。

The international peacekeepers were sent to maintain order after the civil war.

(Chinese) 内战后，国际维和人员被派往那里维持秩序。

You should maintain your car by changing the oil every five thousand miles.

(Chinese) 你应该每五千英里换一次机油来保养你的汽车。

The landlord is legally responsible to maintain the property in a safe condition.

(Chinese) 房东在法律上有责任维护房产处于安全状态。