threshold

1. N-COUNT The threshold of a building or room is the floor in the doorway, or the doorway itself. 门口

He stopped at the threshold of the bedroom. 他在卧室门口停了下来。

2. N-COUNT A threshold is an amount, level, or limit on a scale. When the threshold is reached, something else happens or changes. 界限; 临界点

Moss has a high threshold for pain and a history of fast healing. 莫斯的忍痛力很强，而且有迅速愈合的经历。

3. PHRASE If you are on the threshold of something exciting or new, you are about to experience it. 即将经历

We are on the threshold of a new era in astronomy. 我们将迈入天文学的新时代。