562　protect from和protect against

◎ 这两个短语都是正确用法，protect against后接较大的事情，如战争、灾害、重税、威胁等；protect from后接较小的事情，如frost，harm，catching cold等。

He wore glasses to protect his eyes from the sun. 他戴着眼镜，免受阳光的刺激。

He protected himself against the danger. 他保护自己，免遭危险。

These thick clothes will protect you from the cold. 这些厚衣服能帮你御寒。

They protected the city against enemy's attack. 他们保卫这座城市，免遭敌人的攻击。