小男孩儿萨姆每年春天都会跟着爸爸驱车穿过美加边境来到加拿大北部探险,这也是萨姆亲近大自然的最好时机。他第一次见到那对吹号天鹅是在一片人迹罕至的沼泽旁,它们是一种体型较大、浑身雪白的野生天鹅,因为叫声“咯—嗬!咯—嗬”好似小号,所 Every spring, the little boy Sam follows his father’s drive through the borders of the United States and Canada to visit northern Canada for exploration. This is the best time for Sam to be close to nature. The first time he saw the pair of trumpets swans next to an inaccessible swamp, they were a large, white, wild swan because the sound was “like a trumpet.” , The