maintain
/meɪnˈteɪn/
keep in a certain state, position, or activity; e.g.,
中文释义：维持；保持；保养
It is important to maintain a healthy diet and exercise regularly.
保持健康饮食和定期锻炼很重要。
The government must maintain public infrastructure to ensure safety.
政府必须维护公共基础设施以确保安全。