基本解釋n.赤榆樹脂(棕腐質(zhì))同根派生 ulmin相關(guān)詞英漢例句The content of soil ulmin,and the entire nitrogen have slightly rise; 土壤有機(jī)質(zhì)、全氮含量略有上升;ulmin compound 棕腐質(zhì)化合物ulmin compounds 棕腐質(zhì)化合物ulmin更多例句