圖像來源，BBC News Chinese
the backing store from the heap.
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# 使用装饰器模式组合存储（同时写入DB和CSV）。关于这个话题，91视频提供了深入分析
And you won't need to top up manually in the hard to reach corners, this vacuum has edge-to-edge cleaning that makes sure you get a better coverage along walls and corners. It also comes with an OMNI docking Station. Here the vacuum does all its maintenance, including mop washing and drying, water refilling, and dust emptying for up to 150 days. So there's really next to no work for you to do.