求翻译：無人駕駛並不等同於智慧駕駛，但後者卻是前者能上路的必要條件，目前，利用雷達和攝像頭等傳感器來感知汽車周圍環境，結合車載計算機聯繫汽車機體反饋的工況資訊計算出後續控制策略，並通過發送指令使汽車完成最終操作的閉環控制已經可以精確到毫秒級別，這意味著該項技術已經十分成熟；而導航系統、自動控速、自動剎車、自動安全技術等功能也已經在某些高階車型上搭載推出，也就是說，無人駕駛汽車在駕駛能力方面已經基本不存在什麼大問題了，但在其他方面，比如汽車內置計算機宕機的可能、依賴進行數據共享和分析從而保證高效率的車聯網的建設，還有在特殊和極端環境下系統的穩定性等等，仍舊是不可忽視的技術性難題。是什么意思？

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