What is the scale in poetry? Like Wen Yiduo's Perhaps-Corona, it is said that every line of poetry has four feet, one foot, two feet and three feet.

Adjusting the ruler is also called tone, which means that when reading a poem, you should pause or change the tone slightly. Now it's called syllable. The so-called one foot, two feet and three feet are actually monosyllabic, disyllabic and polysyllabic. Teacher Wen's poem contains these syllables, such as: Maybe (disyllabic) you (monosyllabic) are really (disyllabic) crying too tired (a lot).