This application is designed to help users record the time they spend swimming and record the time they spend running one lap at a time. It can also help two children participate in competitions simultaneously and record the time spent by each user separately. Usage: First click on start to start the timer, and then when lane 1 swims to the end of the lane, click on lane 1 record to record the time spent. Similarly, you can also record the time spent on lane 2, and ultimately obtain a total race time，Please click on about