Háizi zài rénqún zhōng zǒusànle.
The child got separated from the group in the crowd.
Wǒmen zài jǐngqū zǒusànle, qǐng zài ménkǒu děng wǒ.
We got separated at the scenic area — please wait for me at the entrance.
Zhànluàn zhōng, yī jiā rén zǒusànle.
The family was separated during the war.