Alsatian
noun (British English)(also German shepherd North American English, British English)
a large dog, often trained to help the police, to guard buildings or (especially in the US) to help blind people find their way 德国牧羊犬（常训练成警犬，看家护院，尤其在美国用作导盲犬） Word Originfrom medieval Latin Alsatia ‘Alsace’ + -an.