Evolutionary stasis is fairly common at the higher levels of the Linnaean system of biological classification (class, order and family).

在林耐生物分类（类，属和门）系统的高等类别中进化停滞现象是相当普遍的。

We talked about the biological classification of sex, and how it's more complicated than we tend to think.

我们谈到了性别的生物学分类，它比我们想象的要复杂得多。

In Conseil I had a seasoned specialist in biological classification, an enthusiast who could run with acrobatic agility up and down the whole ladder of branches, groups, classes, subclasses, orders, families, genera, subgenera, species, and varieties.

在康塞尔，我有一位经验丰富的生物分类专家，一位狂热的生物分类爱好者，他可以像杂技演员一样敏捷地在分支、类群、纲、亚纲、目、科、属、亚属、种和变种的整个阶梯上上下奔跑。