一旦被人所知，它就迅速传播开来，替代了水钟，但却没有替代日晷，日晷被用来将新机器与原来的计时方法进行对照检查。

Once known, it spread rapidly, driving out water clocks but not solar dials, which were needed to check the new machines against the timekeeper of last resort.

youdao

在地上停留五秒钟是将可食用食物与食物中毒区分开来的临界阈值吗？

Is five seconds on the floor the critical threshold that separates a piece of eatable food from a case of food poisoning?

youdao

那么，在地板上放五秒钟这个时间，是将可食用食物与食物中毒区分开来的临界阈值吗？

So is five seconds on the floor the critical threshold that separates a piece of eatable food from a case of food poisoning?

youdao