心脏病是许多国家的主要健康问题。

Heart ___disease is a major health concern in many countries.

卫生官员正在监测这种疾病的爆发。

Health officials are monitoring an outbreak of the ___disease.

恶劣的生活条件加速了这种疾病的传播。

The spread of the ___disease was accelerated by poor living conditions.