请输入您要查询的英文单词：
单词
ˌsecond ˈclass
释义
ˌsecond ˈclass
NOUN
U
the ordinary method of sending post that is not urgent （比紧急邮件慢的）二类邮件
a
the ordinary seats and service on a train or ship （火车的）二等座位；（船的）二等舱