the Augean Stables idiom
奧革阿斯的牛圈（古希腊传说中国王奥革阿斯圈养牲畜的地方，在赫拉克勒斯到来前从未被打扫过）
in Greek mythology (= ancient stories), the stables (= buildings for keeping horses or cows) of King Augeas, which had never been cleaned until Hercules was given the task of cleaning them
Hercules' fifth labour was to clean the Augean Stables in a limited time. 赫拉克勒斯的第五项功绩是在有限的时间内清理奥革阿斯的牛圈。