If we want to know the possibilities for spiritual growth, value growth or moral development in human being, then I maintain that we can learn most by studying our most moral,ethical,or saintly people.

如果想知道心灵成长的可能性，人类价值增长或道德发展的可能性，那我认为，我们可以研究,最道德或圣洁的人。

哈佛公开课 - 幸福课课程节选

I clean and maintain the park and make sure it's nice and clean and everything.

我打扫公园，维护公园的面貌，确保公园的方方面面都是漂亮、整洁的。

在梅可姆公园 - SpeakingMax英语口语达人

Speaking of behavior, I have to maintain a fertile learning environment in here. We've got round numbers in excess of 400 people sitting here, so I expect certain things here, and that's how we're going to get along.

说到行为，我要维护一个良好的学习环境,我们的人数有点多,400人坐在这，所以，我期待一些事情，那就是我们相处的方式。

麻省理工公开课 - 固态化学导论课程节选

I want to maintain a fertile learning environment.

我希望维护一个良好的学习环境。

麻省理工公开课 - 固态化学导论课程节选