While the Internet's use of language might change rapidly over the next few years, Johnson,Crystal and Jansen all point out that educators need to ensure that students maintain an academic understanding of the use and rules of language.

VOA: standard.2010.01.16

In order for life to proceed, you need to maintain a constant internal environment.

为了维持生命,人体的内环境需要保持稳定

耶鲁公开课 - 生物医学工程探索课程节选

We need to find more creative ways to discipline our students and to maintain control in the classroom.

我们需要用更有创意的方法约束学生，维持课堂纪律。

反对体罚 - SpeakingMax英语口语达人

That's what you need for a phalanx, because to maintain the integrity of the hoplite line, you can't have bumps and grooves, and trees and rivers in the way; it will break things up.

而是方阵作战所必备的条件,为了维持重装步兵队列的完整性,就不能在坑坑洼洼,有树林有河流的地方布阵,这会把方阵打散

耶鲁公开课 - 古希腊历史简介课程节选