1.It does keep people healthy and keeps them safe from sickness.
safe from 免于;沒有…的危險
The President was deluding himself if he thought he was safe from such action.
總統如果認為這樣的行為不會威脅到他,那他就是在自欺欺人 。
She was safe from predatory birds on the verandah.
在陽臺上她不會遭到猛禽的襲擊 。