It consists of a complex mixture of solid and liquid particles of organic and inorganic substances suspended in the air.
它包括悬浮在空气中的有机和无机物的固体和液体复杂混合物。
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。
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。
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