A myocardial infarction happens when the blood flow to a part of the heart is blocked for a long enough time that part of the heart muscle is damaged.当流往部分心肌的血液被阻时间过长，心肌因此受损时，就会发生心肌梗塞。They were blocked from joining the club.他们被阻加入该俱乐部。Trouble blew up when the gang was refused entry to a nightclub.这伙人想进入夜总会被阻，骚乱由此爆发了。