前方至少有多少米的距离无车时,才能超越前车?What is the least distance of clear road you MUST have in front of you when you have finished passing another vehicle?50米50 metres100米100 metres150米150 metres250米250 metres 上一题下一题 反馈问题100米,这个数字需要死记硬背,没有需要特别解释的地方。可以用“100米无车,才能超车”来快速记忆