In the training notice, China Southern clearly requires that "before the training report, please check yourself against the swimming assessment standards. If students can't meet the swimming assessment standard, they should learn swimming in the local area first to meet the swimming assessment standard. Swimming assessment standard: 1. With standard breaststroke movements (1 breath, 1 breaststroke swimmer, 1 breaststroke leg), boys will finish 100m breaststroke in 5 minutes and girls in 6 minutes within the specified time. Every time you stay at the border for less than 5 seconds, the score will be full (100). 2. If you touch the edge of the swimming pool and turn around, you will be deducted 2 points for every second exceeding 10, 4 points for every second exceeding 20 seconds, and so on. "