经过一天漫长的写作之后，一小时的锻炼赋予了我能量。
An hour of exercise after a long day of writing gives me energy.
青少年每天需要8-10个小时的睡眠，因为他们需要大量能量来长成成年人的身体。
Teenagers need 8-10 hours of sleep a day because they need lots of energy to grow into their adult bodies.
通过它们的长腿和阔步，它们能够不知疲倦的走几个小时也感觉不到能量的消耗。
With their long legs and ground-eating stride, they can travel tirelessly for hours on end with no energy wasted.
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