空前绝后

zhè jiàn shì zài lì shǐ shang kōng qián jué hòu

这件事在历史上空前绝后。

The event is historically unique.

zhè kōng qián jué hòu jǔ shì wú shuāng

这空前绝后，举世无双。

It is unique in the world.

dài ěr shōu gòu àn yī tuō zài tuō sì jiāng mián mián wú jué qī dàn tā lì shí zhī cháng yuǎn fēi kōng qián jué hòu

戴尔收购案一拖再拖，似将绵绵无绝期，但它历时之长远非空前绝后。

The Dell buyout seems to have been dragging on forever, but it has a long ways to go before calling the folks at Guinness.