B class的用法和樣例：
例句
- A second- class letter is slower than a first- class.
二等信件比一等信件慢點(diǎn)。 - A two-week return to Washington, second class, please.
為期二周返回華盛頓，二等。 - The relegation to Serie B pushed many Juve players to leave the club.
隨著(zhù)尤文降入乙級，很多球員都離開(kāi)了。 - Particularly in some type of office building sales, Class B concept confusion, the small investors are easily misled.
尤其在一些銷(xiāo)售型辦公樓中，甲級乙級概念混淆，易使中小投資者受誤導。
