检查点将为参加者记录到达时间，并提供紧急支援服务。

The checkpoints are for recording the arrival time of each team, and providing emergency service.

youdao

检查点将为参加者记录到达时间，并提供紧急支援服务。

The checkpoints are for recording the arrival time of each team, and providing emergency service.

youdao