Word Detail

你必须事先预约。

nǐ bì xū shì xiān yù yuē 。

You have to make a reservation.

除非他们事先修好刹车，我才会买车子。

chú fēi tā men shì xiān xiū hǎo shā chē ， wǒ cái huì mǎi chē zi 。

I'll only buy the car if they fix the brakes first.