年龄上的周期变化往往还带来研究和教学上的周期性变化，所以讲座也存在“学术周期”（Academic Cycle）问题。这表现在研究方面尤甚：随着教授、助教授的年龄增加和人员更替，学术的形式和学术生产性也不可避免地发生周期性变化。
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However this is not guaranteed and we will be able to update you with confirmation it will continue at the start of the next academic cycle.
但这一点并不是保证的，我们也不能确认它将在下一个学年仍然执行。
Carbon cycle, as an important scientific method to explain greenhouse effect and to find the control means, has attracted much attention of the academic cycle in the world.
碳循环研究作为揭示其成因及控制方法的重要科学手段已经受到全球的广泛关注。
Academic “life-cycle analyses” go into painstaking detail, factoring in the emissions associated with building factories in which food is produced, for example.
学术“生活周期分析”对此进行了详细的研究分析，极其艰苦地花费了大量的精力时间，比如说分析研究了生产食品的制造工厂与二氧化碳排放量之间的联系。
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