Customer feedback gathered from usability testing is most useful when you need to validate or refine particular interaction mechanisms or the form and expression of specific design elements.
当你需要验证或者优化交互机制，或者具体设计元素的形式和表达方式时，从可用性测试收集的顾客反馈最为有用。
Attempting to collect feedback when a customer already has a problem is obnoxious and counterproductive. Use an interaction that's neutral in tone and purpose, such as a query or order placement.
当顾客已经有问题的时候，收集反馈信息的试图是令人讨厌的，并不能达到预期的目的。
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