Thank for sharing! But who can explain the usage of "-" here?

Thank for sharing, Yezi.

But the use of "-" here caused me confusion. The way "-" that is used is different from what we use it in Chinese. I never fully understand the way it is used in English. The extensive use of "-" in this poem exaggerated my confusion.

Who can explain the usage of "-" in this poem?

Many thanks in advance!