此一时彼一时

Explanation: Refer to different periods of time, the situation is different, can not be compared. 　　Source: Language that "under the Mencius Gongsun Chou": "was then, this is now. There must be five years Hing King, during which there must name the world are." 　　Examples: It was not ~, you ... ... who really old school principal to holding it! ★ Lao She, "Zhao Master said," Brother 6