There are five primary cloud types: stratus, cumulus, stratocumulus, cumulonimbus  and cirrus, each of which are subdivided into different genera based on altitude.

有五种主要的云类型：层云、积云、层积云、积雨云和卷云，每种云都根据海拔高度细分为不同的属。

The beauty of Howard's system was that the basic components could be freely recombined to describe every shape and size of passing cloud--stratocumulus, cirrostratus, cumulocongestus, and so on.

霍华德体系的妙处在于，这些基本成分可以自由组合，描述天空中飘过的每种形状、每种大小的云——一层积云、卷层云、积雨云等等。

A high, whispy cirrus cloud that descended and spread into a sheet was named cirrostratus, while groups of fluffy cumulus clouds that joined up and spread were named stratocumulus.

原本在高空中的纤薄的层云下降并且扩散成薄片状，被命名为卷层云。由大量蓬松的积云聚集并扩散而成的，则命名为层积云。

Now, Asperitas clouds are  thought to be mostly a supplementary feature of stratiform clouds, which are low elevation  layered clouds without vertical development, although asperitas have also been observed to  be stratocumulus or altocumulus.

现在， 阿斯佩里塔云被认为主要是层状云的补充特征，层状云是低海拔层状云， 没有垂直发展，尽管阿斯佩里塔也被观察到是层积云或高积云。