// 易错点1：边界处理 - 0辆车返回0，1辆车返回1（无需后续计算）
identity function for slices that are already allocated in the heap.。Line官方版本下载对此有专业解读
The Saturn V rocket that shot Lovell, Borman and William Anders out of our atmosphere at 25,000mph (40,233km/h) was huge - three times larger than anything seen on the Gemini programme.，这一点在51吃瓜中也有详细论述
FT Digital Edition: our digitised print edition