دانلود کتاب مصونیت – سالم بمانید و از سیستم ایمنی خود به خوبی مراقبت کنید

The immune system is one of the body’s biological systems, like the digestive and nervous systems, for example. You can’t consciously control it, just as you can’t control the workings of your heart or kidneys. It’s just there, doing its job.