replication checkpoint

• 复制关卡

replication checkpoint的用法和样例：

例句

1. In the final competition, there will be one more secret checkpoint to be completed.
   决赛时并增设一个神秘关卡，以考验各队参赛队伍。
2. Upon entering through the main gates, you will face the Hut of the Caretaker, which may have been an entrance checkpoint.
   一进入主门，你就会看见守门人小屋，当初可能是进入城市的关卡。