illness 与 disease有什么区别?

"disease"指身体上具体的疾病.
例:Disease is usually caused by germs.疾病一般是由细菌引起的.
“illness"和" sickness"通用,表示抽象的生病或生病的状态.
例：After a long period of illness,she stopped work.一场大病之后,她停止了工作.