空前绝后 unprecedented
Explanation
形容事物从前没有，以后也不会有，极其罕见。
Describes something that has never existed before and will never exist again; extremely rare.
Origin Story
话说晋朝有个大画家叫顾恺之，他的画作栩栩如生，神韵十足，令人叹为观止；南朝梁代的张僧繇更是以画龙点睛闻名于世，据说他画的龙，只要点上眼睛，就能腾空飞翔，这在当时可是绝技啊！后来，唐代画家吴道子横空出世，他集绘画与书法于一身，将绘画技艺推向了新的巅峰，其作品充满动感和活力，独树一帜，后人难以超越。于是，后世便有人说，顾恺之冠绝前朝，张僧繇独领一时，而吴道子的成就，则可说是空前绝后，无人能及了。
It is said that in the Jin Dynasty, there was a great painter named Gu Kaizhi, whose paintings were lifelike and full of charm, astonishing people; Zhang Sengyou of the Southern Liang Dynasty was even more famous for his ability to paint dragons with eyes, and it is said that his painted dragons, once their eyes were painted, could soar into the air - that was a unique skill at the time! Later, the Tang Dynasty painter Wu Daozi appeared on the scene, combining painting and calligraphy, pushing the art of painting to a new peak. His works were full of dynamism and vitality, unique and hardly surpassed by later generations. Thus, later generations said that Gu Kaizhi surpassed the previous dynasty, Zhang Sengyou led his time, and Wu Daozi's achievements were unprecedented and unsurpassed.
Usage
用于形容极其罕见或独一无二的事物或现象。
Used to describe extremely rare or unique things or phenomena.
Examples
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他的成就，在业界堪称空前绝后。
tā de chéngjiù zài yèjiè kān chēng kōng qián jué hòu
His achievements are unprecedented in the industry.
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这项技术空前绝后，令人叹为观止。
zhè xiàng jìshù kōng qián jué hòu lìng rén tàn wèi guānzhǐ
This technology is unprecedented and breathtaking