Once a man and twice a child真正含义

Once a man and twice a child真正含义 Once a man and twice a child. Once there was a rich man who lived with his wife and child. once/twice/three times a what occurs once in a minute,twice in a moment,and not once what's happening once in a minute twice in a week and once i man ,woman ,child ,a boy and a girl的复数 The old man waters the flowers once or twice a day.(对划线部分提问） once a week和twice a week once a week twice a week. What comes twice a moment ,once a minute and never in a hund What comes twice in a moment,once in a minute and never in a