| (subclass Lumber WoodProduct) | Economy.kif 5874-5874 | 木料 是 WoodProduct 的 subclass |
| (subclass RoughSawnLumber Lumber) | Economy.kif 5886-5886 | RoughSawnLumber 是 木料 的 subclass |
| (subclass FinishedLumber Lumber) | Economy.kif 5900-5900 | FinishedLumber 是 木料 的 subclass |
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