Hanzi
一反既往
一反既往
一反既往
一反既往
一反既往
一反既往
一反既往
一反既往
一反既往
一反既往
一反既往

yī一fǎn反jì既wǎng往

Completely contrary to what was previously the case; a complete reversal from the usual.

他今天的表现一反既往，让所有人都感到惊讶。
His performance today was completely contrary to his usual self, surprising everyone.
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