The interval may be assumed to have been a major formative period in his life: he was 21 years old when it began, 31 when it concluded.
但是这段时间可以被认为是一个人的成形时间(formative period)：开始于他21岁，终止于他31岁那年。
Most of children's free time, especially during the early formative years, should be spent in activities such as playing, reading, exploring nature, learning about music or participating in sports.
孩子的大部分时间，尤其是性格形成早期，应该被用来做以下几种活动，比如玩耍、读书、探索自然、学习音乐或是参与体育活动。
Most of children's free time, especially during the early formative years, should be spent in activities such as playing, reading, exploring nature, learning about music or participating in sports.
孩子的大部分时间，尤其是性格形成早期，应该被用来做以下几种活动，比如玩耍、读书、探索自然、学习音乐或是参与体育活动。
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