It works only in the veins, where the blood flow is slower.

它只在血液流动较缓的静脉中起作用。

《柯林斯英汉双解大词典》

Of those people with high blood pressure, 69% are receiving treatment, yet, only 45% have their blood pressure controlled.

在那些高血压的人当中，69%正在接受治疗，然而，只有 45%的血压得到控制。

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Exercise will not only lower blood pressure but possibly protect against heart attacks.

运动不仅会降低血压，而且能防止心脏病发作。

《柯林斯英汉双解大词典》

Dr.Oduor says in reality, only 1.3 percent of the blood collected is found to be HIV-positive.

VOA: standard.2010.06.04