They represent money. A poker player may,at any time, decide to leave the game.

VOA: special.2010.01.17

There are multiple mechanisms that a cell can use to decide which genes it is expressing at any one time and which ones are not expressed.

在某一时刻,决定细胞中哪些基因表达,哪些基因不表达的机理十分复杂

耶鲁公开课 - 生物医学工程探索课程节选

You want to spend time with your friends. You decide on a movie that you want to see.

你想跟朋友们待在一起。你们决定一起去看一场电影。

I'm going to 课堂 - SpeakingMax英语口语达人