Periodic checks are carried out on the equipment.
设备定期进行检查。
Periodic checks are taken to ensure that high standards are maintained.
进行周期性检查以确保高标准得以维持。
So is my version of the periodic table wrong?
那么我的元素周期表是错的吗？
This kind of periodic orbit is only a phase in a comet's life.
这种周期性轨道只是彗星生命中的一个阶段。
Periodic changes in Earth's orbit could affect Earth's climate.
地球轨道的周期性变化会影响地球的气候。
Early versions of the periodic table had gaps, missing elements.
早期的元素周期表有空缺，缺少一些元素。
Professor Harrison, were you saying that the periodic table is predictive?
哈里森教授，你是在说周期表是可以预测的吗？
Melanomas are more common if you have periodic intense exposure to the sun.
如果你定期暴露在强烈的阳光照射下，黑色素瘤会更常见。
The structure of the periodic table appeared to limit the number of possible elements.
元素周期表的结构似乎限制了潜在元素的数量。
There is this group of about half a dozen right down the diagonal middle of the periodic chart.
沿着周期表的对角线的中间有大约包含六个元素的元素组。
Of course, it was an element the periodic table let us to expect existed before anyone had found it or made it.
当然，它在被人发现或制造前，就是一种元素周期表使得我们期待其存在的元素。
In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.
事实上，后来的研究已经证明，在元素周期表中，元素不应该严格按照原子质量来排序。
By isolating organisms completely from external periodic cues, biologists learned that organisms have internal clocks.
通过将生物体与外部的周期信号完全隔离，生物学家了解到生物体有内部的生物钟。
Online time has doubled since 2006, and social media use has moved from a periodic activity to a daily one in the same period.
自2006年以来，上网时间翻了一番，而与此同时，社交媒体的使用也已经从定期活动变成了日常活动。
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.
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。
Yet Rampino and others question one of the traditionalists' basic assumption: the periodic occurrence of glaciation throughout Earth's history.
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。
In places, the water table is declining at a rate of a meter a year, necessitating the periodic deepening of wells and the use of ever-more-powerful pumps.
在一些地方，水位正以每年一米的速度下降，需要定期加深井并使用更强大的水泵。
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.
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。
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.
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。
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，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。
Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.
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。
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.
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。
Does that explain why it was missing in the periodic table?
这能解释为什么它在元素周期表中缺失了吗？
For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.
例如在元素周期表中，碲排在碘之前，尽管它的原子质量略大一些。
Let's continue our discussion now by talking about orbits, especially those of the so-called periodic-orbit comets.
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。
The close correspondence between the observed properties of gallium and Mendeleyev's predictions for eka-aluminum lent strong support to the periodic law.
镓表现出的性质与门捷列夫对“铝下元素”的预测密切对应，为周期律提供了有力的支持。
Esplanade Company uses the periodic inventory method.
散步路公司使用定期盘存方法。
The bordereaux are periodic reports or settlement statements.
业务报表是定期报告或和解声明。
The dangerous value of the control parameter led to surf-riding and the domain of periodic motion and surf-riding given.
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。
Why do we call it the Periodic Table?
为什么我们叫它周期表？
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