英语语法分析

Alpha and beta thalassaemia have both mild and severe forms.

alpha型和beta型地中海贫血有轻度和重度两种形式。

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。

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。