The German shepherd dog is a breed of large-sized working dog that originated in Germany. They are often trained for many types of work, including assistance, search-and-rescue, police and military roles, and acting.
 German shepherd dog German shepherdGerman shepherd = German shepherd dog = 德國牧羊犬有些人以為德國牧羊犬叫做 shepherd dog，事實上，shepherd dog 泛指所有具備牧羊能力的犬，是個廣泛的名詞，而德國牧羊犬的確有此能力，所以是 shepherd dog 的一種，正確名稱為 German shepherd dog。注意，G 要大寫。
這是一個連環問題: 燃燒石油導致二氧化碳增加，二氧化碳增加導致溫室效應，溫室效應導致冰層融化、海平面上升。 (請填空)
This is a chain of problems. Burning oil leads to increase in carbon dioxide, which leads to the greenhouse effect, which leads to melting of glaciers, which leads to risng sea levels.