// 倒序遍历2*len-1次：模拟数组循环（核心！易错点1）
It was not immediately clear what caused the crash, but some witnesses said the weather at the time was treacherous.
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prevFleetTime = currentTime; // 更新上一个车队的时间为当前时间
It’s also possible to abandon the threshold matrix altogether and instead calculate a value for every pixel coordinate at runtime. If the function is simple enough this can be a good and efficient way to break up patterns and create interesting textures.