positive leap second

例句：

1. 1. Thenew clock has a positive leap second,which means it can be set to anytime of day.
   这款新时钟有正跃进秒，意味着它可以被设定为任何一天的时间。
2. 2. The scientist used thepositive leap second to adjust the timing oftheir experiments.
   科学家利用正跃进秒调整了他们的实验时间。
3. 3. Thepositive leap second is asmall but important adjustment that affectsthe accuracy of timekeeping devices.
   正跃进秒是一个微小但重要的调整，它影响了计时设备的准确度。