People in this town know him as a lunatic. 这个镇上的人们称他为疯子。
You"re driving on the wrong side of the road, you lunatic! 你现在是逆行开车,你这个蠢材!
I really don"t know what kind of man he really is; on one occasion, he is normal, and on another, he acts like a lunatic. 我真不了解他到底是怎样的人; 一会儿正常,一会儿又像个疯子。
用作形容词(adj.)
The man"s lunatic behavior is a menace to society. 那个人的疯狂行为构成对社会的威胁。