它们通常要花费几百美元，通常只由心理学家提供，尽管书店和万维网上充斥着它们的变体。
Generally costing several hundred dollars, they are usually given only by psychologists, although variations of them populate bookstores and the World Wide Web.
现在通常是执行使用一个计算机化的数据库，可在网上提供。
Nowadays it is normally implemented using a computerized database and may be made available online.
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