Clear: The mysterious meaning seems to refer to the dichotomy of Ginkgo biloba leaves. Is it "a life ontology, separated from itself" or "the two are mutually selected and regarded as one"? In fact, it means that he (the knower) can "feel that I am one and in pairs" from Goethe's poems, which seems to be the "split" of Ginkgo biloba leaves. Poets connect with their own ideas and methods of poetry creation through the splitting phenomenon of Ginkgo biloba leaves.