kōng空emptyqián前beforejué绝severhòu后after
Unprecedented and unrepeatable; the first and the last; unparalleled.
Literal meaning
empty (空) — before (前) — sever (绝) — after (后)
Origin
A classical four-character phrase indicating something is unique in history.
Examples
Zhè这cì次zhǎn展lǎn览de的guī规mó模kōng空qián前jué绝hòu后。
The scale of this exhibition is unprecedented.
Tā他de的chéng成jiù就kōng空qián前jué绝hòu后，wú无rén人néng能jí及。
His achievements are unparalleled, and no one can match them.
Usage & nuances
Often used to describe something that is unique and unlikely to be repeated.
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