threshold
noun uk/ˈθreʃ.həʊld/ us/ˈθreʃ.hoʊld/
(ENTRANCE)
[ C ]门槛
the floor of an entrance to a building or room
(LEVEL)
C2 [ C usually singular ]阈，界限;起点
the level or point at which you start to experience something, or at which something starts to happen
I have a low/high boredom threshold (= I do/don't feel bored easily). 我很容易／不容易感到厌倦。
His secretary earns £268 a month, well below the threshold for paying tax. 他的秘书每月挣268英镑，远远不够纳税的标准。
Idiom
on the threshold of somethingidiom C2 在…的开始，在…的起点
at the start of a new and important time or development
We are on the threshold of a new era in global relations. 全球关系即将进入一个新时代。