由于异常通常难以快速处理，所以加载额外的类的附加开销可能使操作延迟超出重要阈值。
Because exceptions are rarely quick to process, the additional overhead of loading extra classes may push operation latency above a critical threshold.
你还可以选择将一个带有附加域的标签页添加到获取额外信息的窗口中。
You might also choose to add a TAB with additional fields to the forms that are provided to capture additional information.
取而代之的，只不过是对额外的附加服务收费的这么一种设想。
Instead, the idea is to charge extra for additional services.
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