third class
noun /ˌθɜːd ˈklɑːs/
/ˌθɜːrd ˈklæs/
- [uncountable, singular] (especially in the past) the cheapest and least comfortable part of a train, ship, etc.
（尤指旧时火车、轮船等的）三等座，三等舱 - [uncountable] (in the US) the class of mail used for sending advertisements, etc.
第三类邮件（在美国用以邮寄广告等） - [uncountable, singular] the lowest standard of honours degree given by a British university
第三等学位（英国大学颁发的最低标准学位）