这个物种流传甚广，却又极端多样化，导致曾被作为不同的分类单元发表。
A species that is both popular and variable, leading to the publication of several weak taxa.
本单元主要围绕定义并分类不同层次的“顾客准备度”为核心逐步展开。
The activities in this module centre around defining and categorizing the different levels of customer readiness.
属于不同分类单元的两个个体所生产的后代。
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