一劳永逸

Explanation: Yat comfort. Hard time, get the job done, since you can no longer demanding the. 　　Usage: -Linked; as predicate, object, attribute; with commendatory 　　Source: Han Ban Gu, "Feng Shan Yan Ming natural" can be described as a labor and long hereby Plaza, temporary fees were also never Ning. " 　　Examples: ~ "If there is there, and ~" to do very little. ★ Lu Xun's "Snappy On retranslation" Thesaurus:  come to a successful end, all troubles end when the main trouble ends, write off at one stroke, When one of the 100, A labor Kyuitsu