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familiar popular farther forward
clustered resembled assembled rendered
GR、AR、CP AR、GR、CP CP、GR、AR GR、CP、AR AR、CP、GR
AC =AR AVC〈AR 或AVC=AR AVC〉AR 或AVC=AR MC=MR
Ar+02 Ar+CO2 Ar+CO2+02 Ar+CO2+02 Ar+He
farther hard quarter sharp
carve courtyard department sugar
AR46-80 AR46-40 AR46-20 都不提供
GR>AR>CP GR>CP>AR AR>CP>GR CP>AR>GR AR>GR>CP
AC=AR AVC〈AR 或 AVC=AR AVC〉 AR 或 AVC=AR MC=MR