首先，范围使我们增加了静态类型检查功能。

First of all, the bounds give us added static type checking.

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毕竟静态类型检查主要是严格防止那种异常。

After all, the whole point of static type checking is to prevent exactly that sort of exception.

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静态类型检查会防止把非string对象传递给这个方法。

Static type checking will prevent non-Strings from being passed to this method.

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