一：表示相对，针对

　　be strange (common, new, familiar, peculiar, distinct, sensitive, immune, vulnerable, indispensable) to

　　Air is indispensable to life.

　　Aircrafts are vulnerable to interference caused by radiation.

　　This injection will make you immune to infection.

　　二：表示对比，比较

　　1：以-ior结尾的形容词，后接介词to表示比较，如：superior ,inferior,prior,senior,junior

　　The quarrel happened prior to my arrival.

　　2: 一些本身就含有比较或比拟意思的形容词，如equal，similar，equivalent，analogous

　　A is similar to B in many ways.

　　3：表示一些先后顺序的形容词，如：second,subsequent,next,preliminary,preparatory

　　Subsequent to the war,they returned to their hometown.