1 sentence

1. 他一边等火车，一边在月台上走来走去。

   tā yī​biān děng huǒ​chē, yī​biān zài yuè​tái shàng zǒu​lái​zǒu​qù.

   He walked back and forth on the platform while waiting for the train.

   Source: Tatoeba