代 (自己) self,oneself,one's own;副 (自然;当然) certainly,of course,naturally,willingly;介 (从; 由) from,since ;
[例句] 发电站烧的煤产自鲁尔地区。 The power stations burn coal from the Ruhr region.
[例句] 所有的皇家轿车都装有电子自导引装置。 All the royal cars are fitted with electronic homing devices.