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祝融號火星車的後輪上,由設計師留下了兩個“中”字。火星車向前行駛,便會在火星大地留下“中”字印記。目前,祝融號已行駛1900多米,留下了近4000個“中”字。火星探測器副總設計師賈陽介紹,這樣的設計不只有紀念意義,也有技術含義:根據字間距,可判斷火星車是否出現打滑等風險。
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