但是对于复杂物体，特别是自由形态物体，由于描述的复杂性以及分割的低可靠性使得问题变得尤为困难。

But regarding to complex object especially free-form object, it is difficult to achieve proper registration result because of the complexity of representation and low segmentation reliability.

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软件应用程序必须满足不同的涉众需求，因此描述这些系统的模型也一定具有复杂性。

Software applications must satisfy a diverse set of stakeholder needs, and consequently, the models describing these systems must likewise be complex.

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本文描述了增量单元升级过程，以及其细微差别、复杂性、限制和对管理员的提示。

This article described the incremental cell upgrade process, with its nuances, complexities, restrictions, and implications for the administrator.

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