除此之外，一天内血液容积和粘稠度也略有变化，因此，人们不难理解，要使血压稳定在可接受的平均值，必须得用复杂的控制器。

Added to this there are slight changes throughout the day in the volume and viscosity of the blood, so one can see that complex controls are necessary to keep blood pressure at an acceptable average.

youdao

除此之外，一天内血液容积和粘稠度也略有变化，因此，人们不难理解，要使血压稳定在可接受的平均值，必须得用复杂的控制器。

Added to this there are slight changes throughout the day in the volume and viscosity of the blood, so one can see that complex controls are necessary to keep blood pressure at an acceptable average.

youdao