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。

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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。

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Some of them are on a galactic scale12, and are associated with natural, periodic events which the Earth has suffered through a number of times previously.

一些因素来自银河系的范围[12]，并与地球多次遭遇过的自然的、周期性的事件有关。

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We know that ionization energy is going to increase as we go across the periodic table, so that means carbon has a lower ionization energy than nitrogen which is right next to us.

我们知道电离能会随着周期表,向右而逐渐变大，因此碳的电离能比旁边的氮要低一些,那么就像我说的。

麻省理工公开课 - 化学原理课程节选

So, how many distinct, so again, we're talking about distinct kinetic energies, a spectrum for the element hafnium, 72 and I'll tell you here that it has a z of 72, so you don't have to spend two minutes searching your periodic table.

好，有多少分立的……还是一样，我们讨论的还是不同的动能，铪元素的光谱中出现，而且我来告诉大家铪的原子序数是，这样你就不用因为在元素周期表中找它,而花费两分钟的时间了。

麻省理工公开课 - 化学原理课程节选

But, by drilling a series of evenly spaced holes into the wire, Dr Lim has created a periodic structure with a band gap that blocks such light.

ECONOMIST: New-age crystals

Mr Manuel, who has brushed off periodic rumours of a cabinet reshuffle, looks more sure of himself than he did a year ago, and is less prone to cracking the sort of poor jokes that had currency traders reaching for their telephones.

ECONOMIST: South Africa's economy: Turnaround | The

Now, she says, the computer alerts the clinic staff when a patient has skipped a follow-up appointment or failed to schedule a periodic screening.

CNN: King: Will health care reform reach rural America?