她是刑法专家。

She's an authority on criminal law.

《牛津词典》

在过去的30年里，斯坦福法律学院监狱专家说加州的刑法系统在世界范围内从最好的下降到了最差的。

In the past three decades, California's penal system "has gone from one of the best to one of the worst in the world", says Joan Petersilia, an expert on prisons at Stanford Law School.

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