1. at the threshold of : 在...的初期；
名词
1. 门槛;门口
The threshold of a building or room is the floor in the doorway, or the doorway itself.
2. (某事发生或改变的)界限，阈，起始点
A threshold is an amount, level, or limit on a scale. When the threshold is reached, something else happens or changes.
3. 在…开端;将要经历;面临着
If you are on the threshold of something exciting or new, you are about to experience it.
1. the sill of a door
a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway
2. the entrance (the space in a wall) through which you enter or leave a room or building
the space that a door can close
e.g. he stuck his head in the doorway
Synonym: doorwaydoorroom access
3. the smallest detectable sensation
Synonym: limen
4. a region marking a boundary
5. the starting point for a new state or experience
e.g. on the threshold of manhood