采用了平面管的线性有限元数学模型和1：4 . 4缩比的简化管束模拟体。
A planar tube mathematical model of linear FEM (finite element method) and simplified model tube bundle on the scale of 1:4. 4 are used in the study.
苔藓植物是植物界中的一大类群，其竞争力非常有限，常生长在维管束植物无法生存的环境中。
Bryophytes comprise is a big family of plant species. Because of their limited competition, bryophytes usually grow in hard habitats, where no vascular plants can live.
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