特别是它们可正计数、倒计数或同时正计数和倒计数。
In particular, they can now count down while being counted and the count or counts down.
倒计数定时器的时间可以随意预置；每组有一个计分器。
Countdown timer time can be arbitrarily preset each has a scoring device.
秒表，这倒计数，预设时间后，会发出一个信号音都过去了。
The stopwatch, which counts backwards, emits a signal tone after a preset time has elapsed.
典型的西方新年聚会在除夕之夜开始，一直持续到新年来临后的几小时，当晚的精彩部分是伴随着午夜钟声倒计数秒。
A typical New Year party in the West would start on New Year's Eve and continue into the early hours of New Year's Day, with the countdown to the stroke of midnight being the highlight of the night.
典型的西方新年聚会在除夕之夜开始，一直持续到新年来临后的几小时，当晚的精彩部分是伴随着午夜钟声倒计数秒。
A typical New Year party in the West would start on New Year's Eve and continue into the early hours of New Year's Day, with the countdown to the stroke of midnight being the highlight of the night.
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