词典释义：
a set of people or things grouped together as the second best
二等，乙级；二流人物，二等品。
[ mass noun]the second-best accommodation in an aircraft, train, or ship
（飞机、火车或轮船的）二等舱。
〈英〉 （大学学位考试成绩的）第二等
-
he obtained a second class in modern history .他现代史考试得了个第二等。
of the second-best quality or in the second division
二等（的）；二流（的）
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[ as adj.]
until 1914women were thought of as second-class citizens .直到１９１４年妇女仍被视为二等公民。
of or relating to the second-best accommodation in an aircraft, train, or ship
（飞机、火车或轮船的）二等舱（的）
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[ as adj.]
I want second-class tickets 我要二等舱的票
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[ as adv.]
they don't fly second-class .他们乘飞机时不坐二等舱。
of or relating to a class of mail having lower priority than first-class mail
（较一类邮件投递速度慢的）二类邮件的
-
[ as adj.]
second-class postage stamps .二类邮件邮票。
(in North America)denoting a class of mail which includes newspapers and periodicals
（北美）（包括报刊的）二类邮件。
[ as adj.]
〈英〉 （大学考试成绩）第二等的
-
a respectable second-class degree .较体面的第二等学位。
