数据显示，2025年中国自动驾驶领域总投入预计达700-750亿元，同比增长40%。但整个中国汽车行业利润率只有4.1%，处于历史低点。利润增长赶不上研发投入增长，尤其对于还在亏损中的车企来说，L3还是L4？曾经是两者都要、循序渐进，现在成了二选一的选择题。
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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.