而这个二说明每单元两拍。

And the 2 says that there'll be two in each of your units.

youdao

我总是慢两拍。

I'm always two steps behind.

youdao

对，这是规则变化，每个和弦都维持两拍，这里一小节两拍。

Yeah, it's regular, and with — each chord was holding for two beats there in duple meter.

youdao

Both melody and bass could have had a triplet but he chose to have the duple in the bass--the triple up above.

旋律和低音部都可以运用三连音,但是他选择低音两拍,高音三拍

耶鲁公开课 - 聆听音乐课程节选

This is to get the feel of the duple and the triple. So see what you can do.

这两个动作,能让你亲身感受两拍和三拍,试试看吧

耶鲁公开课 - 聆听音乐课程节选

Yeah,it's regular, and with-- each chord was holding for two beats there in duple meter.

对，这是规则变化，每个和弦都维持两拍，这里一小节两拍。

耶鲁公开课 - 聆听音乐课程节选