What they also did around the year one thousand was to identify-- to label--these particular spots--spaces and lines.

在公元一千年左右,他们还制定了规范,来标记这每一个点,间和线

耶鲁公开课 - 聆听音乐课程节选

So what we do is we pick an origin, call it zero, we put some markers there to measure distance, and we say this guy is sitting at 1,2,3,4,5.

我们现在选择一个原点,称其为零点,我们做一些标记来测量距离,这个点在五个单位长度的地方

耶鲁公开课 - 基础物理课程节选