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- 这个平时温和的家伙简直发疯了，开枪打死了十个人。
This ordinary quiet guy just freaked out and shot ten people.
- 他发疯似的爱著我妹妹。
He seemed mad keen on (ie very interested in) my sister.
- 他使我快要发疯了。
It drives me crazy.
- 要是疼痛不马上减轻，我会痛得发疯的！
If this pain doesn't go away soon, shall go mad!
- 她确信那个年轻人已经发疯。
She was certain that the young man had gone mad.
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