tier bus

例句：

1. 1. The tier bus is a popular mode of transportation in our city.
   双层巴士是我们城市一种受欢迎的交通工具。
2. 2.The tier bus has become more accessible to people with disabilities.
   双层巴士已经变得更加易于残疾人使用。
3. 3.The tier bus offers a comfortable and convenient way to travel between different parts of the city.
   双层巴士提供了一个舒适且方便的旅行方式，连接城市的不同部分。