| (subclass Lumber WoodProduct) | Economy.kif 5532-5532 | 木料 是 WoodProduct 的 subclass |
| (subclass RoughSawnLumber Lumber) | Economy.kif 5544-5544 | RoughSawnLumber 是 木料 的 subclass |
| (subclass FinishedLumber Lumber) | Economy.kif 5558-5558 | FinishedLumber 是 木料 的 subclass |
|
|