The most common blood kind, or type, is O.

最常见的血型是O型。

Brian says, " I don't think that most of the new regulations would apply to our class of cargo." " Class, " here, means kind or type or classification.

Brian 说，“我不认为大多数新规定适用于我们的货物类别。 ” “类别” 在这里是指种类或类型或分类。