我们在改善我们记忆力、智力和注意力的方面投入了很多精力。
We put a lot of energy into improving our memory, intelligence, and attention.
精力可以理解为体格、感情、社交和智力的能量，留有余地是保存精力最有效的方法。
Margin has the greatest effect on your energy reserves, with energy being understood as your physical, emotional, social, and mental energy.
不管怎样，我对哈佛的回忆主要都与充沛的精力和智力活动有关。
What I remember above all about Harvard was being in the midst of so much energy and intelligence.
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