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

disease 是名词，由前缀 dis-（表示"不"或"失去"）和词根 ease（"舒适"）组成，字面意思是"不舒适的状态"，指"疾病"或"病态"。 在句中指代某种特定的疾病或病态状况。