经济活动常常遵循周期性模式。
进行周期性检查以确保高标准得以维持。
Periodic checks are taken to ensure that high standards are maintained.
时尚业也存在着一个周期性的模式。
他经历了周期性的变化。
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.
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.
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.
爬行动物的骨骼生长在本质上是周期性的，在骨头上产生一系列的同心圆，就像树木的年轮一样。
Bone growth in reptiles is periodic in nature, producing a series of concentric rings in the bone, not unlike the growth rings of a tree.
然而，当在实验室的恒定条件下观察硅藻时，它们仍然表现出周期性的行为，继续按计划挖掘几个星期。
However, when diatoms are observed under constant conditions in a laboratory, they still display periodic behavior, continuing to burrow on schedule for several weeks.
然而，兰皮诺和其他人对传统主义者的一个基本假设提出了质疑：在整个地球历史中，冰川期是周期性发生的。
Yet Rampino and others question one of the traditionalists' basic assumption: the periodic occurrence of glaciation throughout Earth's history.
气候变化及周期性的厄尔尼诺现象引起的海水变暖，已经造成了大面积的珊瑚礁在所谓的“漂白”事件中消失殆尽。
Warmer sea temperatures caused by climate change and periodic El Nio events have caused large areas of coral to be wiped out in so-called "bleaching" events.
伊朗强烈的经济民族主义的周期性高涨，一定程度上必须被理解为对英国在伊朗的商业与英国政府之间密切关系的反应。
Periodic surges of intense Iranian economic nationalism must be understood partly as a reaction to the close relations between British business in Iran and the British government.
这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。
Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
鼻翼两边的阻力呈现一种有规律的周期性变化。
There is a regular cycle of change in resistance between the two sides of the nose.
在这一系列周期性物种灭绝事件里，白垩纪晚期恐龙和菊石的灭绝仅仅是其中一个比较严重的事件。
The late Cretaceous extinction of the dinosaurs and ammonoids was just one of the more drastic in a whole series of such recurrent extinction episodes.
这个“跷跷板”带来了极度寒冷的周期性的严冬和东风，然后突然转换成多年的阴沉春季、过早降雨的夏季和温和的冬季，以及频繁的大西洋海浪。
The "seesaw" brought cycles of intensely cold winters and easterly winds, then switched abruptly to years of heavy spring and early summer rains, mild winters, and frequent Atlantic waves.
控制参数的危险值导致滑行，并给出了周期性运动和滑行的范围。
The dangerous value of the control parameter led to surf-riding and the domain of periodic motion and surf-riding given.
周期性的回顾和修正你的使命宣言。
当然，有的收益下降是周期性的。
美元之前也经历过周期性的疲软。
那么，我们要先讲完周期性规律。
这种周期性还可能成为一种优势。
一种常见用例是执行一些周期性操作。
但相当程度上这些恢复只是周期性的。
大量控制系统要求周期性采样与处理。
Many control systems require periodic sampling and processing.
本图演示了周期性任务调度。
“这是周期性转变”，艾克森告诉我。
“这是周期性转变”，艾克森告诉我。
有些人甚至不明白周期性衰退是正常的。
Some do not even realise that cyclical downturns are normal.
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