boys in their teens 少男;十三到十九岁的男孩 put an end to v.
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the ages from 13 to 19 十三岁到十九岁的年龄；青少年 boys in their teens 少男；十三到十九岁的男孩 put an end to v. stop sth.
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boys in their teens
十几岁的男孩
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By eight years of age, the boys begin to have trouble walking. By their teens they are often in wheelchairs, and by their 20s muscle function is so degraded that they die.
八岁的时候，患有此病的男孩就会开始有行走障碍，十来岁的时候基本就只能坐轮椅了，而到20多岁就将死于严重的肌肉功能低下。
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