Š¿Žšƒ‚ƒoƒCƒ‹ƒQ[ƒ€
Žc”O
period of time =
1. —r
2. Šú
3. •X
4. “o

ƒŒƒxƒ‹3. •ÏX
SDAL“‡‰pŒêŠwZ