A class like TextSplitter (or its future descendents) might contain a bit of functionality that might be useful for a number of concrete descendents.

类似 TextSplitter 的类（或其未来的派生类）往往会包含针对许多具体派生类的有用功能。

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But as before, there are a number of concrete behaviors that we would like to verify.

但是与以前一样，有很多我们可能想去验证的具体行为。

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