However,most agencies can't afford those. You have to have a hangar, it costs quite a bit for maintenance and fuel."

VOA: standard.2010.01.01

One of the main things that we use cell culture or maintenance of cells outside the body for is to make more copies of cells.

我们培养细胞,或者体外维持细胞的重要步骤,就是复制更多的细胞

耶鲁公开课 - 生物医学工程探索课程节选

I work for the park's department. I do maintenance.

我在公园的一个部门工作。我负责维护工作。

在梅可姆公园 - SpeakingMax英语口语达人

Days of torrential rains and a lack of maintenance were blamed for the earthen dam breaking.

VOA: standard.2009.03.28

So it's essential for the maintenance, preservation of the world.

因此祭仪对于维护世界的延续是必不可少的。

耶鲁公开课 - 旧约导论课程节选

"Partly because, while personal counseling and a personal coach might be the Cadillac version of weight loss maintenance, it may not be practical for all people after they've lost weight, whereas if an Internet website can prove to be helpful, something like an Internet website is available.

VOA: standard.2010.07.30