fifths

例句：

1. 1.The team has five members in total.
   该团队总共有五名成员。
2. 2.She counted the penultimate fifth of the sequence.
   她数了序列倒数第二个数字。
3. 3.The fifth book in the series is about a detective.
   系列中的第五本书是关于一位侦探的。