我平时最害怕坐公交车了。公交车上总是那么挤,车里的空气还很差。我还在电视上看到,由于长途汽车超载,出了很多重大事故。我想,能不能在公交车上安装一个自动制动装置。 I am most afraid of riding a bus. The bus is always crowded and the air in the car is still very poor. I also saw on television that due to overloaded coaches, there have been many major accidents. I think I can’t install an automatic brake on the bus.