A displayed formula is a structural drawing that shows every atom and every bond in a molecule explicitly. It matters because it makes the full connectivity and bonding completely unambiguous, which is useful when first learning a structure. It is the most detailed representation, in contrast to the condensed formula, which omits most bonds, and the skeletal formula, which leaves carbon and hydrogen atoms implied.

展开式是一种结构画法,把分子中的每一个原子和每一根键都明确画出。它的意义在于使完整的连接和成键毫无歧义,在初学某一结构时很有用。它是最详尽的表示法,与省略大部分键的缩简式以及把碳和氢默认省略的骨架式形成对照。