Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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可以看到警方从多个方向接近枪手原先的射击位置。
apps, and can also be used to trigger certain actions in one app based on
// 步骤1：计算每辆车的到达时间（精确浮点数，禁止取整）