The diverticulum could be devided into two types:contractile and fibrous type.
可分为有收缩性的肌性心室憩室和纤维性心室憩室。
Half tube type: when the medium containing solid particles or fibrous material, can choose a half tube type structure, this structure has the clean and shear function.
半筒型：当介质中含有固体棵粒或纤维状物质时，可选用半筒型结构，此种结构具有自洁及剪切功能。
Type of root system (tap or fibrous) and density of roots.
根系类型(直根还是须根)和根系密度。
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