就是按照每句有几个音节吧，英文诗的要求不知道～英文haiku一般也可以5/7/5，但不严格，我也不太确定：

https://spice.fsi.stanford.edu/docs/the_history_and_artistry_of_haiku

“In Japanese, a haiku poem is usually divided into three groups/lines of syllables, the first and last with five syllables, the second with seven. However, be careful not to get stymied by strict adherence to the number of syllables and miss the essence of haiku. The 17 syllables is not an absolute rule. Most Japanese syllables are short, as in po-ta-to. English syllables can be long, and take up too much space in a haiku, so English haiku frequently have fewer than 17 syllables, sometimes as few as ten.”