It's a pulsating star that swells and shrinks periodically.

它是一颗脉动恒星，周期性地膨胀和收缩。

Lemmings periodically commit mass suicide, and no one knows just why!

旅鼠会周期性地进行大规模自杀，但是没知道究竟是为什么！

It tells our bodies when to wake up, eat and sleep in a cycle -- a series of activities that repeat themselves day after day.

它会周期性地提示体苏醒，进食，睡觉——这些活动每天都会重复进行。

We'll be looking at various, innovative energy efforts periodically, starting with one underway in Scotland.

我们在周期性地关注能源领域各种创新性努力，从苏格兰在进行一个能源工作开始。

I remember the boats heaving periodically, on the huge gently rolling waves.

我记得船在波浪中周期性地起伏。

And while there have been issues with high-tide flooding, there has not been enough sea level rise to cause high tides " to regularly top" flooding levels, the researcher said.

研究员说，尽管有涨潮洪水问题，海平面还没有上升到太高程度，涨潮也只是周期性地达到洪水阈值。

The binary system periodically brightens by a huge amount partly because the larger star is being pulled out of its normal shape by the white dwarf's gravity.

这个双星系统会周期性地变亮，亮度非大。部分原因是较大那颗恒星被那颗白矮星引力拉扯形状。

UNIDENTIFIED MALE: That's something we've seen in very small numbers periodically over the years.

这是我们多年来周期性地看到一小部分现象。

The best measure, they say, is the cyclically adjusted price-to-earnings ratio, or CAPE, developed by Yale economist Robert Shiller.

他们说，最好衡量标准是周期性地调整市盈率，即由耶鲁大学经济学家Robert Shiller提CAPE。

The electrons that move along an alternating current, on the other hand, periodically and consistently change direction.

另一方面，在交流电中移动电子会周期性地、持续地改变方向。

Better to leave it on, and use something else to periodically block the light reliably and rapidly.

最好不要关灯，用别东西周期性地可靠而迅速地阻挡光线。

Since then, North Korea has gone back, periodically, to using threats to get more money and food.

自那以来，朝鲜经周期性地利用威胁来换取更多金钱和食物。

In the middle of the night, your body actually wakes up periodically, in something called microarousals.

在午夜，你身体会周期性地醒来，这就是所谓微觉醒。

Ebola is a highly infectious virus that has affected areas in Africa periodically over more than 40 years.

埃博拉病毒是一种高度传染性病毒，40多年来周期性地影响着非洲地区。

The grotesque grasshopper that relentlessly pulls time forward periodically winks at passersby.

怪诞蚱蜢无情地把往前拉，周期性地向路眨眼。

Well, they do come periodically, so this is not, you know, the first pandemic, right?

GB：好吧， 它们确实会周期性地现， 所以这并不是， 你知道，第一次大流行病，对吧？

As the star turned into a white dwarf, it periodically ejected mass.

当这颗恒星变成白矮星，它会周期性地喷射物质。

Her sleep is terrible and she's periodically overcome by panic attacks.

她睡眠很糟糕，而且她会周期性地现恐慌发作。

After that, it periodically shows up on funerary goods belonging to the pharaohs.

此后，它会周期性地现在法老陪葬品中。

A spinning neutron star that is emitting radiation beams can be detected as a pulsar on Earth if, as it spins, one or possibly both of its radiation beams recurrently point in Earth's direction as they are swept around through space.

一颗在旋转并释放辐射束中子星，若在旋转过程中， 其一个或可能两个辐射束在空中扫过周期性地指向地球方向， 便可在地球上被探测为脉冲星。