protectfrom用法

　　from后面加对于人的伤害,against后面加对于物的伤害；　　例如：　　Many studies have shown that folic acid helps protect against brain and spinal birth defects when taken early in pregnancy.　　很多研究显示，怀孕早期服用叶酸能对大脑和脊椎生长起保护作用。　　We protect them from some people and from accidents.　　我们保护他们免受人们和意外事故的伤害。