protect … from sth. （保護）使……免於

= protect... against doing 防禦

prevent … from doing sth. 阻止（防禦）...做...

【聯絡】stop sb from doing 阻止...做...

We wear sunglasses to protect our eyes from the sun.

= We wear sunglasses to prevent the sun from harming our eyes.

The sheep protected its young against being attacked by the dog.

= The sheep prevented the dog from attacking its young.

The children were stopped from going home.