也就是 说，实际上在检验字符串长度的顶层代码中你没有花太多开销。

This means you have virtually no overhead on top of the actual code that determines the string's length.

youdao

所有其他非字符实体类型都被忽略，而且不进行检验，即使对于内部子集中的声明。

All other non-character entity types are ignored, and no validation is performed, even for declarations within the internal subset.

youdao

在第一个实例中，字符串是一个直接的服务级别(例如GoldService)，在这种情况下它是已通过检验的、有效证书的CN。

In the first case, that string is an explicit service level, for example GoldService, and in this case it is the CN of a verified, valid certificate.

youdao