问音标s的单词

单词有：busn. 公共汽车vt. 乘公共汽车The bus is leaving from the gate 15 .这辆巴士从15号门离开。

Is this the bus to the library这是去图书馆的公交车吗？The cheapest way to travel is by bus .最便宜的旅行方式是坐公共汽车。Sitting alone on that bus was awful .一个人坐在公车上的感觉糟透了。I 'd been demoted to taking the bus .我被降级到要去搭大巴。