成员的完整列表，这些成员属于 eve::building::PlacementSystem::AreaCellPreview,包括所有继承而来的类成员

accepted	eve::building::PlacementSystem::AreaCellPreview
cellX	eve::building::PlacementSystem::AreaCellPreview
cellY	eve::building::PlacementSystem::AreaCellPreview
reason	eve::building::PlacementSystem::AreaCellPreview