由于青少年是身体发育的时候，我们必须每天加强锻炼，才能有强健的体魄并且才能拥有充满活力的健康。
Since youth is the time for physical development, we must do strenous physical training every day in order to have a strong physique and enjoy vigorous health.
如果我们想保持健康，我们必须坚持每天锻炼身体。
我们每天必须进行足够的锻炼，使身体强健。
We must have plenty of exercises every day and make ourselves strong and healthy.
如果我们想要学好英语，那我们必须每天背大量的单词，同时也锻炼了我们的毅力。
If we want to learn English well, we must recite a large amount of words every day. It also can train our willpower.
如果我们想要学好英语，那我们必须每天背大量的单词，同时也锻炼了我们的毅力。
If we want to learn English well, we must recite a large amount of words every day. It also can train our willpower.
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