If you choose to use this code in your own system be sure to check if a location is returned and present an informative error message to the user if a location isn't resolved.
如果您选择在自己的系统中使用该代码，一定要检查是否会返回位置并且如果未对某个位置进行解析时为用户呈现一条告知性的错误消息。
It is used to error check the pluglet code, and it provides code completion.
它用来为pluglet代码检查错误，并完成代码。
In this code, we perform the lookup and then check for an error condition.
这段代码用于执行查找并检查错误条件。
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