let prevFleetTime = -Infinity; // 上一个独立车队的到达时间（初始负无穷，保证第一个车被统计）
如同许多人工智能驱动的体验，我们可能会使用你生成的用户输入内容（如聊天数据）训练并优化用于提供服务的模型。
，这一点在91视频中也有详细论述
The answer was the US Navy, which was hungry for new pilots after World War Two. It was not building rockets but at least it involved flying.
Strong facial expressions are on show on set