translation.en: And then in the 13th century, more lines and new shapes of notes locked in the concept of the tune exactly, and that led to the kind of notation we have today.
translation.zh: 到了13世纪，更多的线，和不同形状的符号 被确定下来准确的表达音阶， 这就发展成了我们今天的记谱方式。