拼音：jì guān zhī nián
注音：ㄐㄧˋㄍㄨㄢㄓㄋㄧㄢˊ
解释：古代男子二十岁行加冠礼，指已成年。
单字解释： 既 冠 之 年
In ancient times, a man was crowned at the age of 20, which means he has reached adulthood.
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