Prefixes
　　Example
　　a-/an- == no;without;lack
　　a- == in;on;at;by;with;to
　　a-/an- == 加强意义
　　ab- == from;away from
　　ac- == at;to,或表示加强意义
　　ad- == to;toward;forward
　　af- == at;to,或表示加强意义
　　ag- == at;to,或表示加强意义
　　amphi- == 两、双
　　ante- == before
　　anti- == against
　　ap- == 加强或引伸意义
　　ap-/apo- == 离开
　　ar- == at;to,表示加强及引伸意义
　　arch- == 1)big;chief. 2)ancient
　　as == to;forward
　　at- == at;to,表示加强及引伸意义
　　auto- == self;personally
　　be- = make or cause to be
　　be- == 加以...,饰以...,用..做
　　be- == 在
　　be- == 加强及引伸意义
　　bene- == well;good
　　bi- == two
　　by- == 旁、侧、非正式、副
　　circu- == around
　　co- == together
　　col- == together
　　com- == together
　　com- == 加强或引伸意义