Now, if you dug a hole here until there, and of course it may work until that happens.

现在,如果你在地上挖个洞,让这个物体下落时间足够长,那还说得通

耶鲁公开课 - 基础物理课程节选

If you know that, that may be enough for quite some time.

如果你都知道,那在很长一段时间里都足够了

耶鲁公开课 - 基础物理课程节选