妇女的平均月经周期是28天。
我们必须避免类似20世纪80年代那样破坏性的繁荣-萧条周期。
We must avoid the damaging boom-bust cycles which characterized the 1980s.
如果雄蛙能够设法不经历这样的冻结周期就更可能交配成功。
If the male frog could manage not to go through this freezing cycle, he'd probably have more success in mating.
每个潮汐周期都会将植物带到近海海水中，从而被潮水下的生物所利用。
Each tidal cycle carries plant material into the offshore water to be used by the subtidal organisms.
生态学家在研究野兔种群时发现，北美雪兔的生长周期大约为10年。
Ecologists studying hare populations have found that the North American snowshoe hare follows a roughly ten-year cycle.
哈里森教授，你是在说周期表是可以预测的吗？
Professor Harrison, were you saying that the periodic table is predictive?
通常，青少年的睡眠周期会延迟，这导致许多学生直到晚上很晚才感到困倦。
Typically, the preferred sleep cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings.
一棵橡树一旦长成，就有可能在干旱甚至火灾的小周期中存活下来。
Once an oak tree becomes established, it is likely to survive minor cycles of drought and even fire.
科学家们得出结论，太阳风的活动必须遵循相同的周期。
The scientists concluded that the solar wind activity must follow the same cycle.
即使在没有冰川的时期，天文周期也会对地球的气候产生影响。
Astronomical cycles have an effect on Earth's climate even during periods when there is no glaciation.
对于不同的鲎来说，其生理节奏的周期范围在22.2小时到25.5小时之间。
For different individual horseshoe crabs, the circadian period ranged from 22.2 to 25.5 hours.
缓和跳跃的交感神经系统将促进更年期妇女睡眠/唤醒周期的平衡。
Toning down a jumpy sympathetic nervous system will encourage a balanced sleep/wake cycle in perimenopausal women.
地磁活动是地球磁场的自然变化，其波动周期为11年。
Geomagnetic activity, the natural variations in Earth's magnetic field, it fluctuates in 11-year cycles.
这是我们的身体在一天24小时内要自然经历的完整周期。
This is the complete cycle our bodies are naturally geared to undergo within the passage of a twenty-four-hour day.
这是我们的身体在一天24小时内自然调整经历的完整周期。
This is the complete cycle that our bodies are naturally geared to undergo within the passage of a twenty-four hour day.
有可能在34小时之内得出结果，但正常的周期是12天。
It is possible to produce a result within 34 hours but the standard turnaround is 12 days.
加拿大猞猁的丰饶周期为10年，与野兔的丰饶周期相似。
The Canada lynx shows a ten-year cycle of abundance that parallels the abundance cycle of hares.
产品生命周期对营销人员的重要性在于：在产品生命周期的不同阶段需要采取不同的策略。
The importance of the product life cycle to marketers is this: different stages in the product life cycle call for different strategies.
更新周期的循环永远不会结束。
早期的元素周期表有空缺，缺少一些元素。
Early versions of the periodic table had gaps, missing elements.
因此，这两个因素都会影响周期；而实际上，周期似乎是由这两个因素的结合产生的。
Thus both factors can affect the cycle, which, in practice, seems to be generated by conjunction of the two factors.
因此，生物功能的时间和节奏必须与太阳日、潮汐、月球周期和季节等周期性事件密切契合。
Consequently, the timing and rhythms of biological functions must closely match periodic events like the solar day, the tides, the lunar cycle, and the seasons.
现在我们继续讨论，谈谈轨道，特别是那些所谓的周期轨道彗星。
Let's continue our discussion now by talking about orbits, especially those of the so-called periodic-orbit comets.
地轴的倾角也会周期性地变化，在22度到5度之间移动。
The inclination, or tilt, of Earth's axis also varies periodically, moving between 22 degrees and 5 degrees.
我们观察到每年搁浅的鲸鱼数量有明显的周期性，这与一个主要的气候周期相吻合。
We observed a clear periodicity in the number of whales stranded each year that coincides with a major climatic cycle.
打哈欠可能通过周期性地降低肺部的压力来帮助清理肺部。
It might be that yawning helps to clear out the lungs by periodically lowering the pressure in them.
海星的数量会周期性地激增。
地球轨道偏心率的变化大约在96000年的一个周期内发生。
Changes in the eccentricity of Earth's orbit occur in a cycle of about 96,000 years.
卡特拉似乎是半规律地喷发的，典型的周期是每次爆发之间相隔30到80年。
Katla seems to erupt on a semi-regular basis, with typical periods between eruptions of between 30 and 80 years.
轨道的形状并不是始终如一的；它会随时间变化，变化周期为一百年左右。
The shape of this orbit isn't consistent; it varies over time, over a period of about a thousand years.
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