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来源:雅诚德英语网
Only later might their arms have evolved into wings they could push up and down, transforming them from gliders to true powered fliers.
尔后,前肢进化成可以上下拍动的翅膀,于是它们又从滑翔者转型成为真正的飞行家。
Only later might their arms have evolved into wings they could push up and down, transforming them from gliders to true powered fliers.
尔后,前肢进化成可以上下拍动的翅膀,于是它们又从滑翔者转型成为真正的飞行家。