2. "thimble" itself is a knitting skill. Later, just as the word "rendering" was applied to literature, "thimble" also became a rhetorical device. In poetry, thimble poem can also be called Julian poem, which is a poem written with thimble lattice in poetry. The thimble poem uses the suffix of the previous sentence or the previous couplet as the beginning of the latter sentence or the latter couplet, so that the first and last sentences are connected together and supplemented up and down.