We have the convention of music of writing this symbol indicating the beat-carrying unit of four so I'm writing a four underneath each of these.

我们有一个约定俗成的书写格式,来表示四拍一单元,所以我在每行这里的下面写上一个四

耶鲁公开课 - 聆听音乐课程节选

And now I'm just carrying on with the project.

然后现在我就继续做这个项目。

拍摄纪录片 - SpeakingMax英语口语达人