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1·Periodic checks are carried out on the equipment.

设备定期进行检查。《牛津词典》

2·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。《柯林斯英汉双解大词典》

3·So is my version of the periodic table wrong?

那么我的元素周期表是错的吗？

4·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。

5·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。

6·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。

7·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？

8·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。

9·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。

10·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。

周期的

1·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。

2·Typical smart meter designs include periodic transmission of current, phase, and frequency data from the user to the electricity distribution company.

典型的智能度量设计包括来用户端的电流、相位和频率数据向电力调配公司的周期传送。

3·In this example, the periodic basis is just a timer that goes off at a regular, configurable, interval.

在这个示例中，周期基础只是一个计时器，该计时器按照规律的、配置好的间隔到期。

4·This feature can be used to tune database performance according to periodic changes in use, such as switching from daytime interactive use to nighttime batch work.

可以使用这个功能，根据使用过程中的周期变化(例如从白天的交互式使用转换到夜间的批处理工作)来调优数据库性能。

5·For the control system to work, sensor sampling and control must be performed at periodic intervals.

为了保持控制系统的正常工作，传感器的采样与控制必须按照一定的周期间隔。

周期性的

1·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。

2·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。

3·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。

4·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。

5·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。

定期的

1·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。

2·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。

3·Periodic checks are carried out on the equipment.

设备定期进行检查。《牛津词典》

4·Esplanade Company uses the periodic inventory method.

散步路公司使用定期盘存方法。

5·The bordereaux are periodic reports or settlement statements.

业务报表是定期报告或和解声明。

循环的

1·The designs of the perfect discrete single based on the rule of periodic correlative function are discussed in the first part of the paper.

第一部分是以循环相关函数为准则对最佳离散信号进行设计。

2·Through numerical calculation, we get the frequency spectrum of one-dimensional diatomic chain in free and periodic boundary conditions.

通过数值计算，我们得到一维双原子链在自由边界与循环边界条件下的频谱。

(1)periodic table周期表

(1)periodic structure周期性结构；周期组织

(1)periodic wave周期波

(1)periodic inspection定期检修

(1)periodic maintenance定期维修；定期保养

(1)periodic change周期变化；周期变更