What does "step" mean in poetry?

Step: The special combination of stressed syllables and unstressed syllables in English poetry is called step. The number of syllables in a step can be two or three syllables, but not less than two or more than three syllables, and only one syllable can be stressed. Analyzing the meter of English poetry is to divide it into steps, distinguish which are steps and count the number of steps. This step is called scanning. According to the number of steps in an English poem, one step per line is called "step". Each line of poetry has two steps, called "Dimit"; If there are three steps, it is called "three steps"; In addition, there are four tones, five tones, five tones, six tones and seven tones. ....