1·Approximately 5% of the world's population carries trait genes for haemoglobin disorders, mainly, sickle-cell disease and thalassaemia.
世界人口近5%携带血红蛋白疾患的特征基因，血红蛋白疾患主要包括镰状细胞病和地中海贫血。
2·Approximately 5% of the world's population are healthy carriers of a gene for sickle-cell disease or thalassaemia.
全世界近5%的健康人口携带有镰状细胞病或地中海贫血的基因。
3·Recently, gene therapy has been successfully applied to a patient with thalassaemia.
最近，对一名地中海贫血患者成功地应用了基因疗法。