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。
It was several days before the floodwater sank and life returned to normal.
过了几天，洪水才退，生活恢复了正常。
She refused to conform to the normal social conventions.
她拒绝遵从正常的社会习俗。
