As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
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，更多细节参见搜狗输入法2026
（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
sophisticated, with the host computer able to send configuration information