Menstruation is really just a very normal body life cycle.

月经其实只是一个非常正常的身体生命周期。

The prediction of increased high tides starting in the mid-2030s is linked to a normal moon cycle.

从20世纪30年代中期开始的涨潮预测与正常的月球摆动周期有关。

For example, ventricular bigeminy is when a premature ventricular contraction consistently comes after each normal cardiac cycle.

比如，室性二联律就是室性期前收缩在每个正常心动周期之后持续发生。

Night after night, stress-induced cortisol may be confusing your biological clock and interrupting your normal sleep cycle.

夜复一夜，压力诱发的皮质醇会让生物钟混乱，干扰我们正常的睡眠周期。

Ventricular trigeminy, on the other hand, is when one consistently comes after every two normal cardiac cycles.

而室性三联律，就是一次室性期前收缩持续发生于每两个正常心动周期之后。

Light pollution affects the way nocturnal animals hunt, how insects breed, and more, by disrupting their normal daily cycles.

光污染会影响夜行动物的捕猎方式、昆虫的繁殖方式，等等，因为光污染会扰乱它们正常的日常循环。

A recession is typically defined as two negative quarters of economic growth and is part of the normal business cycle.

经济衰退通常被定义为经济在两个季度都呈负增长，它是正常的商业周期的一部分。

A recession is typically defined as two negative quarters of economic growth and as part of the normal business cycle.

经济衰退通常被定义为两个季度的经济负增长，是正常商业周期的一部分。

This is the normal reproductive cycle.

这是正常的生殖周期。

It turns out morning erections are part of the normal sleep cycle and occur multiple throughout the night.

事实证明，早晨勃起是正常睡眠周期的一部分，并且会在整个晚上多次出现。

When a premature atrial contraction consistently comes after each normal cardiac cycle, it's called atrial bigeminy and when one consistently comes after every two normal cardiac cycles, it's called atrial trigeminy.

当一个房性期前收缩总是紧接着每一个正常心动周期而来时，它被称为二联律；当一个房性期前收缩总是紧接着每两个正常心动周期而来时，它被称为三联律。

Later symptoms include amenorrhea, an absence of a normal menstrual cycle, even after a period of lactation, which is due to a lack of luteinizing hormone and follicle stimulating hormone.

晚期的症状包括闭经，即月经周期不正常，甚至就在哺乳期后出现，这是由于缺乏黄体生成素和卵泡刺激素。

On average, the menstrual cycles of people who were vaccinated varied in length by less than one day, which is interesting but not medically significant since normal menstrual cycles vary by up to seven days each cycle.

平均而言，接种疫苗的人的月经周期长度变化不到 1 天，这很有趣，但没有医学意义， 因为正常的月经周期每个周期最多变化 7 天。