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

这是我们多年来周性地看到的一小部分现象。

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的病毒，40多年来周性地影响着非洲地区。

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

它是一颗脉动的恒星，周性地膨胀和收缩。

California is riddled with geological fault lines that periodically ruptures the biggest.

加州到处都是周性断裂的地质断裂带。

Since there is no global ocean, rivers and lakes periodically dry out.

由于没有全球海洋，河流和湖泊会干涸。

I would, you know, meet periodically famous people or people that were very wealthy.

我会会见名人或非常富有的人。

The team followed up by counting ants periodically on specific sections of the coffee bushes during the days that followed.

之后团队计算咖啡灌木中某一特部分的蚂蚁数量。

So, in order to rectify this, we have to periodically add an extra day to the calendar.

所以，为了纠正这一误差，我们必须在日历上额外增加一天。

Private insurers periodically collect money in the form of premiums paid by individuals or their employers.

私人保险公司以个人或雇主支付保险费的形式钱。

The best way to protect against this risk is to periodically give yourself a retirement checkup.

要防止这种风险，最好的办法就是检查自己的退休账户。

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

另一方面，在交流电中移动的电子会周性地、持续地改变方向。

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

自那时以来，朝鲜经常周性地利用威胁来换取更多金钱和食物。

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

最好不要关灯，用别的东西周性地可靠而迅速地阻挡光线。

PELAGRA will suck ocean water with marine snow into containers and periodically bring them to the surface for detailed study.

“PELAGRA ”将会收集海洋雪，并对它进行细致研究。

They enjoyed their midnight meal so much that they determined then and there to form a club and have such entertainments periodically.

他们很喜欢这次宵夜，于是当场决成立一个俱乐部，举办这样的活动。

Scientists have to periodically rearrange them in order to find the best configuration with the least amount of radio interference.

科学家必须重新设置下天线，从而在最小无线干预的情况下找到最佳配置。

Officers will be driving by your house periodically looking for anything suspicious.

警察会在你家周围巡逻 检查可疑情况。

He used a lawyer to periodically provide him with insider information.

他利用一个律师为他提供内幕消息。

Several data services collect and periodically publish information about the circulation and audiences of various media.

一些数据服务收集并发布有关各种媒体发行量和受众的信息。

Almost but not quite. So, in order to rectify this, we have to periodically add an extra day to the calendar.

这是个大约时间，并不精确。因此，为了纠正误差，我们必须在日历上增加一天。