同義詞
1. the enclosing boundary of a curved geometric figure, especially a circle
- perimeter
- , border
- , boundary
- , edge
- , rim
- , verge
- , margin
- , outline
- , fringe
- , bounds
- , limits
- , extremity
- , confines
- , marge
- , bourn
- , skirt
2. the distance around something