名词
中文翻译：青春的丰富
同义词：
['vigor', 'vitality', 'zest']
例句：
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1.The youthfulness of the new team is evident in their enthusiasm for the game.
新团队的活力在他们对比赛的热情中显而易见。
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2.She was full of youthfulness and energy when she arrived at the party.
她到达派对时充满了活力和精力。
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3.As the years went by, he seemed to lose his youthfulness and become more reserved.
随着岁月的流逝，他似乎失去了青春的活力，变得更加内敛。