不意

bù yì jìng rú cǐ

不意竟如此

happen unexpectedly

bù yì tā jiù jí fù fā yī shí nán yǐ chéng xíng

不意他旧疾复发，一时难以成行。

A sudden relapse of the illness delayed his planned trip.

zhèng jiàn de bù yì diū shī

证件的不意丢失

unexpected loss of credentials

bù yì dà yǔ rú zhù

不意大雨如注。

Unexpectedly, it poured with rain.

bù yì zhī zhōng tā shòu shāng le

不意之中，他受伤了。

He hurt himself in a moment of carelessness.

lì yòng dí rén de bù yì lái zhēng qǔ zì jǐ de zhǔ dòng

利用敌人的不意来争取自己的主动

exploit the enemy's unpreparedness to gain the initiative