second class
adjective (also second-class) uk/ˌsek.ənd ˈklɑːs/ us/ˌsek.ənd ˈklæs/
(NOT IMPORTANT)
（人）次要的
less important than other people
Women are still treated as second class citizens. 女性仍然被当作二等公民对待。
(LESS EXPENSIVE)
（火车、飞机等）二等（的）
relating to the less expensive way of travelling in a train, aircraft, etc., that most people use
a second-class seat/ticket 二等车厢／票
UK（邮件）二类的
Second-class post is less expensive and sent less quickly than first-class.
second-class mail/postage 二类邮件／邮资
How much is a second-class stamp? 一张二类邮票多少钱？
(QUALIFICATION)
（大学学位）二级优等的
a degree from a university in the UK and some other countries that is a good degree but not the best possible
second class
adverb uk/ˌsek.ənd ˈklɑːs/ us/ˌsek.ənd ˈklæs/
（火车、飞机等）二等（的）
If you travel second class in a train, aircraft, etc., you use the less expensive type of ticket that most people use.
We always travel second class. 我们旅行总是买二等票。
UK二类邮件（的）
If you send something second class, you send it using the less expensive type of post.
How much less would it cost to send it second class? 用二类邮件寄，会省多少钱？
second class
noun [ U ] uk/ˌsek.ənd ˈklɑːs/ us/ˌsek.ənd ˈklæs/
（飞机或火车的）二等座位
the seats on a plane or in a train that are less good and less expensive than first class
Second class is at the rear of the train. 二等车厢在火车尾部。
UK二类邮件
a less expensive and slower type of post than first class
How much does it cost for second class? 寄二类邮件要多少钱？