一方面原因在于该问题的复杂性，其设计内容包括外部布局和内部布孔的集成方案制定；
One reason for that is the complexity of this problem, which mainly consists of outer layout and inner connection problems.
一方面原因在于该问题的复杂性，其设计内容包括外部布局和内部布孔的集成方案制定；
One reason for that is the complexity of this problem, which mainly consists of outer layout and inner connection problems.
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