同一时段内本险种仅有一份计划有效，超过无效。
Only one insurance scheme will be effective during the same period of time, others will be invalid.
同时也意味着掌握拍马的艺术：加州大学伯克利分校的詹妮弗·查特曼做了一些实验，她试图在试验中找到一个临界点，超过该点，拍马便无效。
It also means mastering the art of flattery: Jennifer Chatman, of the University of California, Berkeley, conducted experiments in which she tried to find a point at which flattery became ineffective.
超过应用程序功能的期望值或界限(例如，当输入无效的信用卡号时，恰当的错误处理启动了吗？)
Exceeding expected values or boundaries of the application's function (e.g., does the right error handling get triggered when entering an invalid credit card number?)
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