Circumstances are different now; what was true or applicable at one time is no longer so at another; times have changed.
我们以前放学后总是一起玩耍，现在大家都忙于学业和各自的兴趣，真是彼一时，此一时啊。
We used to always play together after school, but now everyone is busy with studies and their own interests; truly, times have changed.
Era:
Ancient
Frequency:
Story:
During the Warring States period, King Kuai of Yan entrusted his political power to Prime Minister Zi Zhi, which led to internal turmoil. The State of Qi took advantage of this chaos to invade Yan and seize its territory.
Mencius strongly advocated for military intervention, urging King Yan to submit to King Qi as a vassal to promote benevolent governance.
However, King Qi was only interested in the land and wealth of Yan. Mencius's student, Chong Yu, was very dissatisfied.
Mencius sighed and remarked, "That was one time, and this is another."
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