注意扶杆上那个红按钮，它是干什么用的？“紧急”？用英语怎么说“紧急，？”

Please pay your attention to red push button in pole. what does the British do with it?

youdao

注意扶杆上那个红按钮，它是干什么用的？“紧急”？用英语怎么说“紧急，？”

Please pay your attention to red push button in pole. what does the British do with it?

youdao