疏部，稀疏

运用稀疏法分析物种丰富度的海拔梯度分布格局:以样方实测乔木种数据为例

rich gas heating with flue gas rarefaction in coke ovens

rarefaction of bone

rarefaction

rarefaction【声】

rarefaction state【物】

rarefaction region【地物】

rarefaction

rarefaction of air