This must be done carefully, however, because too much free space will mean an abundance of index pages, which could negatively impact query performance and even insert processsing itself.

所以这样做时要小心，不过，太多的自由空间意味着大量的索引页，这对查询的性能乃至 insert 处理本身都会产生负面影响。

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Compared with existing ROI-based image retrieval approaches, it makes use of space information of ROI and multi-resolution retrieval concept, is able to query shape-free and any size objects.

与已有的基于感兴趣区域的检索方法相比，该方法很好地利用了感兴趣区域的空间信息，采用多分辨率检索思想，能够有效地对不同大小任意形状的物体进行检索。

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