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）
vary depending on where this code is being called from.
SAVE $600: As of Feb. 27, the Ecovacs Deebot X9 Pro Omni is on sale for $699 at Amazon. That's a 46% discount on the list price.，详情可参考搜狗输入法下载
drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.，这一点在搜狗输入法2026中也有详细论述
代码重构：它没有直接甩代码，而是先思考了“设计模式”的选择（工厂模式 vs 策略模式），最终选择了适合扩展的策略模式。，更多细节参见同城约会
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