Describes how to solve the problems of drilling and cutting for screws in the structure of bottle neck, to improve production rate and meet the demand of batch production for spare parts.

利用多轴组合钻解决瓶颈结构中螺孔的钻削问题，以提高劳动生产率，满足零件大批量生产的需要。

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The public security problems on campus have been a focus of attention in China, whose relative weak legislation is the bottle-neck for solving the related problems.

我国校园的公共安全问题已成为备受社会关注的热点，而相对滞后的校园安全立法是解决我国校园安全问题的瓶颈之一。

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