Meaning of wài:
外
external; outside; foreign
Wǒ xǐhuān zài jiàqī de shíhòu qù wài dì lǚyóu.
我喜欢在假期的时候去外地旅游。
I like to travel to external places during the holidays.
Jīntiān wǒ xiǎng qù wài miàn sànbù.
今天我想去外外面散步。
Today I want to go for a walk outside.
Tā láizì yīgè wàiguó.
他来自一个外国。
He comes from a foreign country.
in addition
Tā yāo qǐngle wǒmen zhīhòu, hái gěi wǒmen zhǔnbèi le lìng yī gè jīngxǐ zài wài.
他邀请了我们之后,还给我们准备了另一个惊喜在外。
After inviting us, he also prepared another surprise in addition.