There may be a little uncertainty about whether the pizza place is still going to be open late at night when you get hungry.

就是当你饿的时候,不能确定批萨店是否还营业

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

but that's definitely something that can change

但是还不能确定下来，

哥伦比亚大学的教程 - SpeakingMax英语口语达人