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comes of age

成年 / 達到法定年齡

指一個人達到法律或社會認可的成年年齡，通常意味著獲得完全的權利和責任。在劇中，Rhaenys 預言如果 Viserys 國王有了兒子，等這個兒子成年後，人們會期望他繼承王位。

and chances are better than not that one of those will be male.

And when that boy comes of age and your father has passed,

the men of the realm will expect him to be heir, not you.