There are questions about time-keeping and payment-tracking systems.

有关于工作计和跟踪支付系统的问题。

Using a timer, break your work into 25-minute intervals separated by 5 minutes blocks of rest.

使用计器，将工作 25 钟的段，中有 5 钟的休息。

The unemployment system, which was invented in the 1930s, is still in kind of a time work.

这个失业制度于上世纪30年代制定，目前仍按计工作操作。

And that two hundred lightbulbs were tested to make sure they work during the countdown to midnight.

并对200个灯泡进行检测，以确保它们在跨年倒计期正常工作。

Today, the light signals work on an electrical timing system.

今天，光信号在电子计系统上工作。