chēxiāng tài lěng, tài rè huò yǒu yìwèi, kěyǐ zhǎo chéngwùyuán fǎnkuì

车厢太冷、太热或有异味，可以找乘务员反馈。

If the carriage is too cold, too hot, or has an unpleasant smell, you can report it to the attendant