1.(sill at doorway)门槛
2.(doorway)门口；出入口
3.(starting point)起点；开端；开始
4.【心】(strength at which stimulus is perceived)阈限(指外界引起有机体感觉的最小刺激量)
5.(level)(某事发生或改变的)阈, 界限
(minimum level)临界点
6.【物】(minimum intensity of signal, etc)阈；阈值
7.on the threshold of sth
(verge)面临着…；将要经历…；在…的开端