It was not supposed to be used until they got to the Moon. It had no heat shield, so could not be used to re-enter the Earth's atmosphere. But it could keep them alive until they got there.
swap(&arr[low], &arr[j]);
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除机器人之外，AI硬件与视听娱乐是创新科技展区的另一条重要主线，探索AI如何以更自然、更直观、更具沉浸感的方式，重塑人与技术之间的交互关系。
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If you’re looking for an instant camera that offers the most old-fashioned, instant-film experience, the Polaroid Flip is the camera for you. It resembles vintage instant cameras like the Polaroid 600 more than any other camera on our list, thanks to its classic, retro-inspired design and flip-up lid. Its square I-Type film prints and iconic white frame give photos an authentically vintage look, while modern touches like Bluetooth, USB-C charging, and a beginner-friendly companion app add greater convenience and creative control.
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