Maintaining that level energy and vigor is of great concern to men of all ages.

对各个年龄层的男人来说，保持高水平的精力和活力非常重要。

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It takes advantages of the basic ecosystem principle of multi-level energy exploitation and substance recycling to reasonably design food chains.

它以生态系统中能量多级利用和物质循环再生为基本原理，按照这一原理，就可以合理设计食物链。

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Achieving success at this level requires a commitment of time and energy.

取得这种水平的成就需要花费时间和精力。

《牛津词典》

When a dog's energy level is higher than the owner's energy level, it can lead to problems.

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There are ways to get refills without waiting or paying, as players receive full energy upon a level up and energy potions can be acquired in a variety of other ways within the confines of the game.

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In each layer, electrons exist at a different level of energy, determined by the layer's thickness.

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