A second- class letter is slower than a first- class. 二等信件比一等信件慢点。
A two-week return to Washington, second class, please. 为期二周返回华盛顿，二等。
The relegation to Serie B pushed many Juve players to leave the club. 随着尤文降入乙级，很多球员都离开了。
Particularly in some type of office building sales, Class B concept confusion, the small investors are easily misled. 尤其在一些销售型办公楼中，甲级乙级概念混淆，易使中小投资者受误导。
