Lignin: Complex oxygen-containing organic compound, a mixture of polymers of poorly known structure.
木质素：一种复杂的含氧有机物，是结构尚不清楚的多种聚合物的混合物。
An aldehyde is an organic compound containing a formyl group.
醛是一种含有甲酰组的有机化合物。
Of, relating to, or constituting an organic compound containing a metal, especially a compound in which a metal atom is bonded directly to a carbon atom.
属于、关于或组成一种有机化合物，该化合物包含一种金属，特别是金属原子直接与碳原子相连的化合物。
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