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.
你知道太阳活动是有周期的。
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.
他经历了周期性的变化。
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?
爸爸,我需要记住一个关于植物繁殖周期的单元。
Dad, I need to memorize a unit about the reproductive cycle of plants.
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.
地球轨道的周期性变化会影响地球的气候。
Periodic changes in Earth's orbit could affect Earth's climate.
您可以根据工作和休息之间的周期来管理自己的能量。
You manage your energy in cycles that vary between work and rest.
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.
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.
这并不是说生物钟的周期是固定不变的。
This is not to suggest that the period of this biological clock is immutably fixed.
每一种新产品都会有一个相对较长的使用周期。
我签订的三年期合同已于上周期满。
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.
这种周期性轨道只是彗星生命中的一个阶段。
This kind of periodic orbit is only a phase in a comet's life.
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.
每个生物体的生命周期都极其独特。
Every organism has a life span which is highly characteristic.
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.
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.
那么我的元素周期表是错的吗?
鱼类的生命周期使其成为一种人类的基本食物。
Their life cycle helps man provide himself with a basic food—fish.
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.
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