change bidirectional association to unidiredtional
Change Bidirectional Association to Unidiredtional(将双向关联改为单向关联) Replace Magic Number with Symbolic Constant(以字面常量取代魔法数) .
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change bidirectional association to unidiredtional
将双向关联更改为单向关联
以上为机器翻译结果，长、整句建议使用 人工翻译 。