additionalextra a. beyond what is usual or necessaryextrasoddsupererogatorysuperfluoussupernumerarysuperunmeraryx,x. extra额外: extra; additional; added的: 4次方是 The fourth power of 2 i ...额外的;格外的: extra (l03)额外的,余额,超额: excess额外的超过: ext extra下载手机词典可随时随地查词查翻译