People suffering from lung diseases often need specialized treatment.

lung 的意思是"肺"，指人体内负责呼吸的主要器官。 diseases 是 disease 的复数形式，disease 指"疾病"，特指某种特定的病态状况。 lung diseases 指影响肺部正常功能的各类疾病，统称为"肺部疾病"。