人生地不熟(rén shēng dì bù shú)To be a stranger here.

Explanation

“人生地不熟”比喻初到一个地方，在当地没有认识的人，也不熟悉当地的情况，各方面都很陌生，有点儿恐惧的意思在里面。
“人生地不熟” is a metaphor for first arriving in a place wher everything is strange, creating a slight sense of being afraid.
Words:

安全ānquán:safe;
同学tónɡxué:classmate.

Sentences

1. Jiǎ：Tīngshuō nǐ bù xiǎng gēn wǒmen chū guó lǚyóu.
甲：听说你不想跟我们出国旅游。
A: I hear that you don’t want to travel abroad with us.

Yǐ：Rén shēng dì bù shú de ，méiyìsi .
乙：人生地不熟的，没意思。
B: I would be a stranger there; it’s of no interest to me.

2. Jiǎ：Dào guówài zìjǐ yào zhùyì ānquán ，rén shēng dì bù shú de.
甲：到国外自己要注意安全，人生地不熟的。
A: You should stay safe when abroad, as you will be a stranger there.

Yǐ：Méiguānxi ，wǒ yǒu hǎo jǐ ge tóngxué zài nàr.
乙：没关系，我有好几个同学在那儿。
B: It doesn’t matter; I’ll have many classmates with me.