Closed couplet
(重定向自Closed couplets)
In poetics, closed couplets are two line units of verse that do not extend their sense beyond the line's end. Furthermore, the lines are usually rhymed. When the lines are in iambic pentameter, they are referred to as heroic verse. However, Samuel Butler also used closed couplets in his iambic tetrameter Hudibrastic verse.