他虽已年近七旬，但依然健硕如昔，活力四射。(remain)

Although he is nearly seventy years old, he remains as strong and energetic as ever.

考查动词和让步状语从句。陈述客观事实，为一般现在时。“虽……” 可以用although引导让步状语从句；“他已年近七旬” 翻译为he is nearly seventy years old；“依然” 用动词remain表示；“健硕” 用形容词strong；“活力四射” 用形容词energetic表示；“如昔” 翻译为 “as ... as ever”。故翻译为：“Although he is nearly seventy years old, he remains as strong and energetic as ever.”。