Virtually all species in nature, from single-cell organisms to mammals, including humans, exhibit a daily cycle of activity called circadian rhythm.

几乎自然界中所有的物种，从单细胞生物到哺乳动物(包括人类)，都具有一种日常活动周期，称为昼夜节律。

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Calcium is important in the physiologic process of muscle or nervous reaction, nervous impulse transmission, heartbeat rhythm maintenance, blood solidification, cell coherence and so on.

在神经，肌肉应激，神经冲动的传递，心动节律的维持，血液凝固，细胞粘着等生理过程中，具有重要的意义。

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It is well known that the developmental inherent rhythm occurs during the development of secondary vascular tissue. Synchronously, the cell ergastic substance shows dynamic changes.

众所周知，树木次生维管组织的发育具有内在的节律性，与此同时维管组织的细胞内含物也会发生动态变化。

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