oracle 简单的问题

oracle 中
new.字段名是啥意思，  例如下面的代码CREATE OR REPLACE TRIGGER T_EvaluationCon_insert BEFORE INSERT
ON EVALUATIONCON
FOR EACH ROW
Declare
n1 Number;
begin
     select max(NORDERNUM)
       into n1
       from EvaluationCon
       where NEVALUATIONINFOID=:new.NEVALUATIONINFOID;    If n1 is not null Then
       :New.NORDERNUM:=n1+1;
    else
        :New.NORDERNUM:=1;
    end if;
end;