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On film, large dogs seem powerful, but their size decreases their ability to use oxygen efficiently.
在電影里，體型巨大的狗狗看似強壯，但其實它們的體型降低了其利用氧氣的能力。
In competitive dog-sledding, dogs usually weigh less than 55 pounds and can comfortably trot over 70 miles a day.
在雪橇犬的競技中，通常體重不到55磅的狗狗每天可輕松跑70英里。
A sled dog also needs the right temperament. They must love running and be sociable and obedient.
雪橇犬的性情也得溫和。它們必須熱愛奔跑，友善且溫順。
Like wild dogs, each team has a hierarchy, but the dogs struggle for position by taking aggressive or submissive postures such as squealing and rolling.
和野狗一樣，每個隊伍都有等級制度，不過雪橇犬會采取侵略性或順從的姿勢來爭奪位置，比如尖叫和滾動。
Real dogfights are rare because the dogs are carefully introduced and trained before going out on the trail.
它們混戰的機率很小，因為它們在進入雪橇隊前接受了良好的引導和訓練。
The careful crossing of northern dogs, like Malamutes, with southern breeds like Greyhounds produces dogs with the right stuff to be sled dogs.
愛斯基摩狗等北方品種與長腿獵狗等南方品種交配得當的話，他們的后代將具備成為雪橇狗的優良基因。
譯文為可可英語翻譯，未經授權請勿轉載!
