From the Angle of economics the development of country touring has strong characteristics of exterior and communal that belonging to the traditional realm of market failure.
从经济学角度，乡村旅游开发具备强外部性和公共性特征，属于市场失灵的传统领域。
2
A second method is to furnish the surfaces with hinges and to use an exterior sector with drilled holes for each Angle setting.
第二种方法是在翼面上装置铰链，用一个对不同安装角钻有不同孔的外部扇形件与之配合。
3
Look the thing that this should be clearly, but demand comes from a client namely (here wants to consider) from the Angle of interior and exterior client.