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来源:雅诚德英语网
Larger feathers could have increased lift incrementally, until sustained flight was gradually achieved.
较大的羽毛可以逐渐增加升力,直到逐渐实现持续的飞行。
Larger feathers could have increased lift incrementally, until sustained flight was gradually achieved.
较大的羽毛可以逐渐增加升力,直到逐渐实现持续的飞行。