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来源:雅诚德英语网
When the front bird moves its wings up and down, the resulting force of the air lifts the next one.
当前面的鸟上下移动它的翅膀时,产生的空气力会带动下一只鸟。
When the front bird moves its wings up and down, the resulting force of the air lifts the next one.
当前面的鸟上下移动它的翅膀时,产生的空气力会带动下一只鸟。