threshold

She stood hesitating on the threshold.

她站在门口，犹豫不决。

I have a high pain threshold.

我的痛阈很高。

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

那么，在地板上放五秒钟这个时间，是将可食用食物与会导致中毒的食物区分开来的临界阈值吗？

The threshold for regulation is high.

监管的门槛很高。

She felt as though she was on the threshold of a new life.

她觉得好像就要开始新生活了。

This nameless person pushed the human race over a historic threshold, for it was in that year that mankind became, for the first time in its history, a predominantly urban species.

这个无名人士让人类的发展跨出了历史性的一步，因为正是在那一年，人类在其历史上第一次成为主要的城市物种。

Taxiing is not just about driving to the runway threshold.

飞机滑行并不只是滑到跑道入口。