WBS编码：WBS编码是其每个元素的独一无二的识别码。编码应当易于扩展，以适应未来的版本更新。
WBS code Numbers: the WBS code number is a unique identifier for each element of the WBS and should be such that it can be easily expanded to accommodate any future revisions to the WBS.
WBS编码：WBS编码是其每个元素的独一无二的识别码。编码应当易于扩展，以适应未来的版本更新。
WBS code Numbers: the WBS code number is a unique identifier for each element of the WBS and should be such that it can be easily expanded to accommodate any future revisions to the WBS.
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