MYSQL代码哪里错了?

create table classes (  id varchar(32) not null,  tea_id varchar(32) default null,  cour_id varchar(32) default null,  room_id varchar(32) default null,  cour_time varchar(32) default null,  primary key (id)  KEY FK_Reference_4 (tea_id),  KEY FK_classes (cour_id),  CONSTRAINT classes_ibfk_1 FOREIGN KEY (cour_id) REFERENCES course (id),  CONSTRAINT FK_Reference_4 FOREIGN KEY (tea_id) REFERENCES teacher (id) );

各位牛人帮小弟看看啊~~~哪里错了

为什么就报这个错

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use near 'KEY F
K_Reference_4 (tea_id),
        KEY FK_classes (cour_id),
        CONSTRAINT classes_ibfk' at line 8

我用的是MYSQL5.0的版本

已经解决

呵呵~~~