“®ŽŒƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
open (transitive) =
1.
‚ ‚Ñ‚é
2.
‚ ‚¯‚é
3.
‚·‚é
4.
o‚·
‚¾‚·
ƒŒƒxƒ‹4.
•ÏX
SDAL“‡‰pŒêŠwZ