third class
in sing.
1- a group of people or things considered together as third best第三等（人）; 三等品。
1.1
- Brit. a university degree or examination result in the third-highest classification〈英〉（大学考试成绩）第三级, 丙等。
1.2
- mass noun US a cheap class of mail for the handling of advertising and other printed material that weighs less than 16 ounces and is unsealed〈美〉第三类邮件（指广告或重量在16盎司以下、不加封的印刷品）。
1.3
- mass noun chiefly historical the cheapest and least comfortable accommodation in a train or ship〈主史〉（车厢、舱位等收费最低廉的）三等座（或舱）。
1
- of the third-best quality or of lower status第三等的（地）, 丙等的（地）：
as adj. many indigenous groups are still viewed as third-class citizens.许多土著人群仍然被当成三等公民。
1.1
- as adj. Brit. of or relating to the third-highest division in a university examination〈英〉（大学）考试成绩第三等的：
he left university with a third-class degree.
他大学毕业时成绩丙级。
1.2
- US of or relating to a cheap class of mail including advertising and other printed material weighing less than 16 ounces〈美〉（邮件）第三类的; 作为第三类邮件（投寄）：
as adj. third-class mail.第三类邮件。
1.3
- chiefly historical of or relating to the cheapest and least comfortable accommodation in a train or ship〈主史〉（车厢, 舱位）三等的; 乘坐三等车（或舱）：
as adj. a suffocating third-class compartment令人窒息的三等车厢
as adv. I travelled third class across Europe.我乘坐三等列车游历了欧洲。