同義詞
1. a strip of wood or stone forming the bottom of a doorway and crossed in entering a house or room
- doorstep
- , sill
- , doorsill
- , doorway
- , entrance
- , entry
- , way in
- , door
- , gate
- , gateway
- , portal
- , approach
2. a point of entry or beginning
- start
- , starting point
- , beginning
- , brink
- , verge
- , edge
- , dawn
- , birth
- , origin
- , inception
- , conception
- , opening
- , launch
- , inauguration
- , institution
- , initiation
- , debut
- , creation
- , day one
- , kick-off
- , commencement
3. the maximum level of radiation or a concentration of a substance considered to be acceptable or safe
反義詞
「1. a point of entry or beginning」的反義字