But getting a practical, reliable flying car off the ground has been a serious challenge.
不过，想要造出实用又安全的飞行汽车一直是个严峻的挑战。
The challenge to us all now is to ensure these are translated into practical action.
现在对我们大家的挑战就是确保这些能够转化为实际的行动。
The challenge to us all now is to ensure these are translated into practical action.
现在对我们大家的挑战就是确保这些能够转化为实际的行动。
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