作业帮It's ---------for a man to fly without the help for a machine.
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It's ---------for a man to fly without the help for a machine.
It's ---------for a man to fly without the help for a machine.
It's ---------for a man to fly without the help for a machine.
It's ----impossible-----for a man to fly without the help for a machine.
不借助工具,人类是不可能飞行的~