O-17：over the edge 疯了
A:I hear that Mary got mad.
A:我听说玛丽疯了。
B:So I heard.
B：我也听说了。
A:What's wrong with her?
A:怎么搞的？
B:She went over the edge after her son was killed in an accident.
B：自从他儿子在一次车祸中丧生后，她就疯了。
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