汲古润今，鉴往知来，习近平总书记始终自觉从马克思主义理论和党的光辉历史中重温为政初心，总是善于从中华文明积淀的智慧中汲取为政之道。
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"This is a new scientific field. It's hard to speculate because it's changing so quickly," Wing says.
British astronaut Tim Peake said it could take a while to re-adjust.
Associated Press reporter Anthony Izaguirre in Albany, New York, contributed to this report.