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一些中老年人定期到医院输点活血化淤、扩张血管的药物,预防血栓、冠心病或栓塞发生。这样做有预防作用吗?
Some middle-aged and elderly people regularly go to the hospital to donate blood stasis, dilate blood vessels to prevent thrombosis, coronary heart disease or embolism. Does this have a preventive effect?