心肌梗塞是心脏病发作的医学术语。
Myocardial infarction is the medical term for a heart attack.
医生多年前已经知道高密度脂蛋白(HDL)可以通过清除不良的低密度脂蛋白胆固醇(即已知的LDL)来保护对抗心脏病发作和心肌梗塞。
Doctors have known for years that HDL, or high-density lipoprotein, protects against heart attacks and stroke, probably by cleaning up the bad low-density lipoprotein cholesterol, known as LDL.
细节：当心肌梗塞开始发作的时候，可能不会有胸疼的感觉。心脏病发作在睡眠的时候，60%的人没有再醒过来。
Detail: at the beginning of myocardial infarction you may not feel chest pain at all. 60% of people who had a heart attack while sleeping will not wake up.
细节：当心肌梗塞开始发作的时候，可能不会有胸疼的感觉。心脏病发作在睡眠的时候，60%的人没有再醒过来。
Detail: at the beginning of myocardial infarction you may not feel chest pain at all. 60% of people who had a heart attack while sleeping will not wake up.
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