If the input will later be used as parameters to operating system commands, scripts, and database queries, then it is essential that you do so.

如果输入以后会被用作操作系统命令、脚本和数据库查询的参数，那么对输入进行清理是非常重要的。

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Replacement operators ensure that malicious scripts can't append SQL into queries to override the existing code and get access to data that they shouldn't see.

替换操作符确保恶意脚本不能将SQL附加到查询中覆盖现有代码，访问它们不应该看到的数据。

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