放置在涡流中的涡流笼圈计数出涡流源的转数。
A vortex cage located in the vortex counts the revolutions of the vortex pool.
您可以将您的圈计数好队友和你只集中在你的游泳。
You can leave the lap counting to your good mate and you just concentrate on your swimming.
天美铁人三项30圈提供100小时计时码表，30圈的内存召回，99圈的计数器，并配备夜灯。
The Timex Ironman 30 lap provides a 100 hour chronograph, 30 lap memory recall, a 99 lap counter and also is equipped with a nightlight.
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