第一个理由是灵活性和可定制性。
打包软件吹嘘其可定制性，但还是有对定制程度的限制。
Package software touts its customizability, but there are limits to how much can be tailored.
之所以选择它，是因为它的可定制性及其对所需要的映射的支持。
It was chosen because of its customizability and support for the required mappings.
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