const posToTime = new Map(); // 位置 → 到达终点的时间（避免重复计算）
要卖到欧洲，就必须符合当地严苛的法规。车身刚性要满足欧洲五星安全标准，内饰材料要通过欧盟的环保认证，前面提到的母婴级环保座舱并不是营销话术，而是进入欧洲市场的入场券。
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Tim Fernholz is a journalist who writes about technology, finance and public policy. He has closely covered the rise of the private space industry and is the author of Rocket Billionaires: Elon Musk, Jeff Bezos and the New Space Race. Formerly, he was a senior reporter at Quartz, the global business news site, for more than a decade, and began his career as a political reporter in Washington, D.C.