on one occasion he is normal and on another he acts like a lunatic
他时而表现得很正常，时而又表现得像个疯子
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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。
youdao
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