const dropOld = Stream.push({ highWaterMark: 2, backpressure: 'drop-oldest' });
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.，详情可参考一键获取谷歌浏览器下载
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黎廣德說，目前情況一直發展下去，政府能否找出合適的方案給居民，「其實這件事是不樂觀的」。
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