second per revolution

例句：

1. 1.The car's speedometer shows thenumber of seconds per revolution.
   汽车的转速表显示每转一圈的秒数。
2. 2.The clock is set to show the timein seconds per revolution.
   时钟设置为显示每转一圈的时间。
3. 3. The racers are competingfor the fastest second per revolution.
   赛车手们正在竞争最快每转一圈的秒数。