1 sentence

1. 乘坐飞机旅行时，人们可以每半小时在过道上走来走去。

   chéng​zuò fēi​jī lǚ​xíng shí, rén​men kě​yǐ měi bàn​xiǎo​shí zài guò​dào shang zǒu lái zǒu qù.

   When traveling on an airplane, people can walk up and down the aisle every half an hour.

   Source: CCMatrix