A long, long time ago, cowboys were wanderers, driving their herd from place to place, looking for fresh grass and water. 在很久很久以前，牧童都是游牧者，趕著(zhù)他們的牧群到處尋找青草和水源。
Some tribes migrate with their cattle in search of fresh grass. 有些部落為了尋找新鮮的牧草而帶著(zhù)他們的牲畜遷移。
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