the fifth one
今年第五个抢匪
The fifth robber this year.
— 出租车司机 (2017)
一旦你杀了四个人，很容易再去杀第五个
Once you've killed four people, it's easy to kill a fifth.
— 西部往事 (1968)
你明白，如果你已经杀了四个，很容易再有第五个
You understand that if you've already killed four, it's easy for there to be a fifth.
第五个？
The fifth one?