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.
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。
The precondition of operating this commercial activity pattern is to create customers' resource network.
这种商务活动模式的运作前提是构建用户的资源网络。
Daily activity pattern: Przewalskii horse has partially resumed intrinsic activity pattern with its living condition change.
日活动规律：随着生存环境的改变，野马已部分恢复其自身活动节律。
According to the activity-based travel demand forecasting concept and modeling, a full-day activity pattern model was developed.
根据基于活动的出行需求预测思想和建模方法建立了日活动计划模型。
Some smokers know that nicotine increases the brain activity pattern associated with relaxation and that in low doses it can stimulate certain nerve cells that produce feelings of alertness.
有些吸烟者知道尼古丁增强与精神放松有关的大脑活动模式，还知道小剂量的尼古丁能刺激产生机敏警觉感的神经细胞。
Some smokers know that nicotine increases the brain activity pattern associated with relaxation and that in low doses it can stimulate certain nerve cells that produce feelings of alertness.
有些吸烟者知道尼古丁增强与精神放松有关的大脑活动模式，还知道小剂量的尼古丁能刺激产生机敏警觉感的神经细胞。
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