双向延伸
- 网络two-way stretch;stretching both ways
双向延伸-
光电子能谱与同系能级线性规律（Ⅲ）&双向延伸体系
Photoelectron spectroscopy and the line-arity of the homologous energy factor (ⅲ) & two direction extending system
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德育坐标沿传统回归与现代创新的双向延伸；
The coordinate axis of moral education stretches along both the traditional inheritance and the modern innovation .
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双向延伸，即品牌以中端市场进入分别向高端和低端市场延伸；
Secondly , two-way extension refers to brand access to mid-market firstly , and then extend to high-end and low-end market respectively .