In 1970 a group of researchers looking into blood groups tested the blood types of inhabitants in a block of flats in Liverpool.

1970年一个研究血型的团队给利物浦几个街区的居民做了血型测试。

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Once that plaque builds up, it can rupture and completely block the artery, cutting off the blood supply to your heart.

一旦斑块堆积，则会损伤并完全阻塞动脉，造成心脏缺血。

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Increased levels of circulating caffeine may block adenosine's action, causing blood vessels to constrict, subsequently triggering a heart attack, says El-Sohemy.

血液中咖啡因水平的增加会阻碍腺苷的作用，导致血管收缩，最终则可能导致心脏病发作。埃尔-索海米说，在这项研究中，大约有55%的人携带有减缓咖啡因代谢的基因。

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Clots can block the flow of blood to the heart or brain and cause a heart attack or stroke.

VOA: special.2009.10.20

The deformed cells block blood vessels and cut off the flow of oxygen to tissue in the body.

VOA: special.2009.12.16

Blood clots can block an artery and cause a heart attack.

VOA: standard.2010.03.04