protect...from...表示“保护……不受……侵袭,挡住,防御”. from后接能带来伤害或损害之物.
e.g.
1：You should protect the children from catching cold.
你应该防备孩子们受凉.
2.You had better wear sunglasses to protect your eyes from the sun.
你最好戴上太阳镜来保护眼睛免受太阳（伤害）.
3.Laws would protect us from hurt.
法律会保护我们免受伤害.
希望对你有所帮助~~