seconds counter

例句：

1. 1. The clock on the wall shows that it's time to start counting down the seconds.
   墙上的钟显示是开始倒数秒的时候了。
2. 2.He set up a stopwatch to count the number of steps he took in a certain amount of time.
   他设置了一只秒表来计时他在特定时间内走的步数。
3. 3.The engineer used a stopwatch to measure the time it took for the project to complete.
   工程师用秒表测量完成项目所需的时间。