"标出格律" can be translated into English as "mark out the metric pattern" or "indicate the rhythmical structure".
"Mark out" means to clearly show or identify something.
"Metric pattern" refers to the rhythmic or metrical structure in poetry or verse.
"Indicate" means to show or point out.
"Rhythmical structure" also conveys the idea of the organized pattern of sounds or beats in poetry.
Both translations convey the meaning of identifying or showing the rhythmic structure of a poem or verse. Depending on the context, one might be more appropriate than the other. For example, in a more technical or literary analysis context, "mark out the metric pattern" might be preferred, while in a more general or descriptive context, "indicate the rhythmical structure" could be used.