In this case, both the length and index values are zero, so they match.
在本例中，长度和索引值都为0，所以它们是匹配的。
Zero-based index of an image within the image list.
从零开始的索引图像在图像列表。
Index numbering starts from zero.
索引编号从零开始。
The zero-based index of the first matching item.
第一个匹配项的从零开始的索引。
Its essence idea is that to improve system performance index by zero-pole assignment.
它的基本思想是通过零极点重新配置，达到改善系统性能指标的目的。
Its essence idea is that to improve system performance index by zero-pole assignment.
它的基本思想是通过零极点重新配置，达到改善系统性能指标的目的。
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