She is a mental defective.

她是个心智缺陷者。

youdao

As Robert Leider, a fellow at the University of Pennsylvania School of Law points out in a Wall Street Journal opinion article, a federal law which generally prohibits the possession or acquisition of a firearm by a person who has been adjudicated as a mental defective or who has been committed to a mental institution is both under- and over-inclusive.

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