劍橋詞典a situation in which someone starts to behave like a child , especially because of mental weakness caused by old age （尤因年老智力衰退造成的）第二童年期 Her grandfather's in his second childhood and talks nonsense most of the time . 她祖父年老昏聵，大多數(shù)時(shí)候總是不知所云。 返回 second childhood