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来源:雅诚德英语网
Birds also have built-in timepieces which send them off on fall and spring migrations.
鸟类也有天生的时间感应器指导它们秋春迁移。
Birds also have built-in timepieces which send them off on fall and spring migrations.
鸟类也有天生的时间感应器指导它们秋春迁移。