Heart failure occurs when not enough blood can be pumped through the body.
当没有足够血流可以供全身使用时发生心衰。
For example, the authors note that in most countries surveyed, many patients took medicine to lower blood pressure, but not enough to really bring blood pressure under control.
例如，研究报告的作者指出，在大多数他们调查的国家里，很多病人服用药物降低血压，但并没有把血压控制在正常水平。
You get problems with your blood circulation and not enough oxygen goes to your brains, and that's why you faint.
你的血液循环有问题,没有足够的氧气提供给脑部，这就是为什么你会晕眩。
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