我对这个城市很陌生，什么都不认识。

wǒ duì zhè ge chéng shì hěn mò shēng, shén me dōu bù rèn shi.

I'm very unfamiliar with this city; I don't recognize anything.

一个陌生的电话号码打了过来，我没敢接。

yī ge mò shēng de diàn huà hào mǎ dǎ le guò lái, wǒ méi gǎn jiē.

An unfamiliar phone number called, and I didn't dare answer.

刚到新公司的时候，周围都是陌生的面孔。

gāng dào xīn gōng sī de shí hou, zhōu wéi dōu shì mò shēng de miàn kǒng.

When I first arrived at the new company, I was surrounded by unfamiliar faces.