In each event, the Olympic Committee or association of each country or region can only send at most two athletes who meet the A-level standard of the Olympic Games. Only one athlete can take part in the Olympic bid B. In each relay event, each national or regional Olympic Committee or association can only send one team to participate.
When a national or regional Olympic Committee or association does not have a player who meets the Olympic standards, it can send a male player and a female player to participate in the competition.
Specific requirements of swimming competition rules:
In the Olympic swimming competition, any athlete who fouls during the take-off will be disqualified.
Freestyle, breaststroke, butterfly and individual medley must take off from the starting platform, and backstroke should start in the water.
In freestyle and backstroke, athletes can touch the wall with only one hand when they reach the finish line, but in breaststroke and butterfly, athletes must touch the wall with both hands at the same time.
Refer to the above content: Baidu Encyclopedia-Swimming