No, it was about public speaking. The different dots indicated different lengths of pauses: short, medium, and long.

没错，是关于口语的。不同的圆点代表不同长度的停歇：短的，中等长度的，较长的。

Moving on now, punctuation was invented by the Ancient Greeks. They used a series of dots to indicate different lengths of pauses.

我们现在继续说，标点符号是古希腊人发明的。他们用一系列圆点表示不同长度的停歇。