There are three basic kinds of line: Solid line, Graduated line, and Soft line.
三种基本线固定线，层次线，柔和线。
The image clear degrees of the active faults are divided into three basic kinds.
按其影象清晰程度可分为三种基本类型。
There are three basic kinds of the underhand serve the overhand serve and the hook serve or roundhouse serve.
有三种基本的发球方法：下手发球，上手发球和钩手发球或大力（抡臂）钩手发球。
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