The Dugout in the Side of a Hill When the pioneers began their conquest of the western prairie, they found materials for building shelters close at hand.是什么意思_The Dugout in the Side of a Hill When the pioneers began their conquest of the western prairie, they found materials for building shelters close at hand.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句