Keen 词形变化 Keens 复数 Keens 释义与例句 name 1. A surname. 相关短语 keen as mustard keen on 热衷于有兴趣的 keen as a bean keen as knives keen as a Jew peachy keen jelly bean peachy keen treat them mean, keep them keen treat 'em mean to keep 'em keen young and keen treat 'em mean, keep 'em keen