请教protect against 的protect from区别

例句
1,He is always protecting against others.他总是防范着别人~
2,He is always protecting him from danger.他总是保护着自己免受侵害~
短语
protect against 直接加名词~意为“防范.”
protect from 一般用作protect A from 意为“使A免受B的侵害”