木兰目不能看作是一个祖先类群。
这表明其是一个自然类群。
水生植物的另一特殊类群由附着水生植物构成。
Another special group of water plants is formed by the haptophytes.
水母类是海洋生态系统中非常重要的一个类群。
我意思是它们好丑，而且是沙栖类群，你为什么要帮助它们呢？
I mean they are ugly and ammophilous. Why do you want to help Komodo Dragons?
睡莲类植物是目前植物分子系统学与进化研究的一个重要类群。
Water lily plants are key group on study of the flowering plant phylogeny.
光合细菌作为一类古老的细菌类群，已经在众多领域得到应用。
Photosynthetic bacteria is a kind of ancient microorganism and has been applied in many areas.
研究群决策过程中五类不确定性偏好的集结方法。
The group aggregation approach for five style uncertain preference information is studied.
目的：从蜱类媒介中分离斑点热群立克次体。
Objectives: To isolate spotted fever group rickettsiae from tick vectors.
得到了一类自同态幺半群不是正则的图。
A family of graph which is not End-regular is constructed in this paper.
提出并研究了一类具有脉冲干扰和混合功能反应的三种群捕食链模型。
In this paper, a three species food chain model with impulsive perturbations e.
提出并研究了一类具有脉冲干扰和混合功能反应的三种群捕食链模型。
In this paper, a three species food chain model with impulsive perturbations e.
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