threshold
- n. 入口；门槛；开始；极限；临界值
英英释意
- 1. the starting point for a new state or experience;
- "on the threshold of manhood"
- 2. the smallest detectable sensation
- 3. the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close;
- "he stuck his head in the doorway"
- 4. the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offer support when passing through a doorway
- 5. a region marking a boundary