地球绕轴自转，引起昼夜的变化。名词化结构。
The rotation of the earth on its own axis causes the change from day to night.
据卢卡说，海洋是种植植物的好地方，因为水下温度较为稳定，昼夜变化很小。
According to Luca, the sea is a good place to grow plants because underwater temperatures remain stable, changing little from day to night.
白天和黑夜被分为均等数量的部分，所以除去昼夜平分点，白天和黑夜时间是不等的；当然，这些时长也因季节变化而变化。
Day and night were divided into the same number of parts, so that except at the equinoxes, days and night hours were unequal; and then of course the length of these hours varied with the seasons.
这些时段被称为“日光时”，因为它们的持续时间随着不同季节而带来的昼夜长短的变化而改变。
These periods became known as temporal hours, because their duration varied according to the changing length of days and nights with the passing of the seasons.
这是一种被称为睡眠类型的昼夜节律的良性变化。
This is a benign variation within circadian rhythms known as a chronotype.
这两种装置在阳光充足的气候条件下工作良好；但在北欧，太阳可能一次被云层遮挡数周，而温度不仅随着季节变化，而且还随着昼夜变化。
Both these devices worked well in sunny climates; but in northern Europe, the sun may be hidden by clouds for weeks at a time, while temperatures vary not only seasonally but from day to night.
昼夜长短之类的自然变化是如何对野生动物产生如此深刻的生理变化及行为变化呢？
How do natural variations such as the changing day length make such profound alterations to physiology and behaviour?
科学家们很久以前就发现，昼夜光线的变化对于设置生物钟起着重要的作用。
Scientists have known for a long time that the light of day and the dark of night play important roles in setting our internal clocks.
即便是街灯、满月，或者邻居家传来的微弱光线，也能干扰入睡所需的昼夜节律变化。
Even the barely noticeable ambient light from streetlights, a full moon, or your neighbor's house can interfere with the circadian rhythm changes you need to fall asleep.
“据了解，昼夜节律被打乱的生物会产生新陈代谢变化，如果发生在人身上，就会增加心脏病的风险。”Fisher说。
"It is known that animals with disrupted circadian rhythms develop metabolic changes that, if they occurred in people, would increase heart disease risk," Fisher said.
在20世纪初，科学家们发现，动物也有昼夜节律：即使没有如光线之类的外部变化的提示，动物也能保持一个24小时的活动周期。
In the early 1900s scientists found that animals have circadian rhythms, too: they also are capable of maintaining a 24-hour-long activity pattern in the absence of external cues such as light.
昼夜节律是人体的内在时间跟踪系统，预计环境变化和适应每天合适的时间。
Circadian rhythms are the body's intrinsic time-tracking system, which anticipates environmental changes and ADAPTS to the appropriate time of day.
生物节律：由生物钟控制的周期性的生理上的或行为上的变化。昼夜节律就是一个很好的例子。
Biorhythm a periodic physiological or behavioral change that is controlled by a biological clock. Circadian rhythms are an example.
第三部分详细分析时间问题中绝对时间变化的问题，从昼夜、四季以及历史方面着手深入。
The third part, which mentions many kinds of aspects such as the change of day and night, the four seasons and history, etc, analyzes the so called absolute change of time particularly.
积极调节、改善非杓型高血压病人血压昼夜变化的功能，对防止靶器官损害更具有临床意义。
The regulative function for diurnal blood pressure variations should be improved to prevent the target organs damage in non-dipper type hypertension patients.
人为控制环境下，对玉米幼苗叶片中电解质外渗率、MDA含量以及保护酶活性的昼夜变化同步进行了测定。
The diurnal variations of electrolyte leakage, MDA concentration and cell defense enzyme in leaves of maize seedling were synchronously measured under the artificial conditions.
指出纬向梯度、经向梯度、全梯度矢量的昼夜变化与季节特性。
The latitudinal and longitudinal gradients, their diurnal variations and seasonal characteristics are dealt with.
SDNN与冠心病室性早博频次存在明显的昼夜节奏变化和相关性。
There were significant day-night cycles and correlation in SDNN and the number of VPBs.
结论急性冠脉综合征患者血小板表达的CD 40及CD 40 L显著增高，且血小板表达的CD 40l呈现出昼夜节律的变化规律。
Conclusion: Patients with ACS show significantly increased coexpression of CD40 system and circadian variation at CD40L concentration on platelets.
目的：研究高血压病人昼夜血压变化与靶器官损害的关系及其临床意义。
Objective: To study the relationship and clinical significance between diurnal blood pressure variations and target organs damage in essential hypertension patients.
目的探讨纯收缩期高血压脑出血患者的发病与年龄、脉压及昼夜节律变化的关系。
Objective To investigate the relationship between pure systolic hypertension cerebral hemorrhage and age, pulse pressure and circadian rhythm changes.
在不考虑其它因素影响的条件下，细纱断头率在一昼夜内存在着周期性变化的现象。
Neglecting the influence of other interfering factors. it is found that the end breakage rate varies periodically round the clock.
就是这样的倾斜角度才使我们有四个季节。有昼夜长短的变化。
It is this tilting that accounts for our four seasons and the lengthening and shortening of days and nights.
目的研究阻塞性睡眠呼吸暂停综合征（OSAS）患者心率变异性（HRV）昼夜变化，探讨利用HRV指标筛选OSAS的效果。
Objective To investigate daytime and nighttime variation of heart rate variability(HRV)in patients with obstructive sleep apnea syndrome(OSAS), and to evaluate the screening capacity of HRV.
血压昼夜节律变化与高血压靶器官损害和心血管意外的发生密切相关。
Circadian change of blood pressure is closely related to target organ injury of hypertension and cardiovascular accident.
该算法通过对实际路面的平均灰度值随时间变化趋势进行了统计学习，寻找出随天气季节变化的昼夜区分时间。
An algorithm of distinguishing day and night with image statistics is proposed based on the analysis of the characteristics of the grey level of actual road surface.
土壤温度成为影响土壤呼吸的昼夜变化主要环境因子。
Soil temperature was the mainly factor controlling the diurnal variation of soil respiration.
本文并讨论了复眼光感受器结构昼夜变化的功能意义，以及与自然光照的关系。
The functional significance of the day and night changes of the photoreceptors and their relations to natural light illumination were discussed.
本文并讨论了复眼光感受器结构昼夜变化的功能意义，以及与自然光照的关系。
The functional significance of the day and night changes of the photoreceptors and their relations to natural light illumination were discussed.
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