2th和2nd的区别
没有2th，第二 nd second第二十二 nd twenty-secondseconddet./ord.第二(的);(重要性、规模、质量等)居第二位的;另外的;外加的adv.以第二名;以第二位;(用于列举)第二，其次
The whole operation is performed in less than three seconds.
全部运算在三秒内完成。
It was her second break in the set.
这是本盘比赛中她第二次接发球得分
Her second husband was the exact opposite of her first.
她的第二任丈夫与第一任截然不同。