要是你占我的坐,我占你的坐,大家都乱坐,车厢里该乱作一团了。
yàoshi nǐ zhàn wǒ de zuò ,wǒ zhàn nǐ de zuò ,dàjiā dōu luàn zuò ,chēxiāng lǐ gāi luànzuòyītuán le 。
If you take my seat and I take yours, everyone not seating according to assigned seats, there’ll be chaos in the train cabin.