极靴是电机上的关键零件，其作用是使气隙磁阻减小，改善磁场分布，并使励磁绕组容易固定。

Pole pieces, key parts on electrical motor, reduce the reluctance of the air-gap; improve the static magnetic field distributions and fix the excitation windings.

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由于液压挺杆自动调节气门间隙为零间隙，同时可降低发动机噪声。

Because the hydraulic valve plunger automatic control valve clearance is zero gap, simultaneously may reduce the engine noise.

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本文同时研究分析了康托结构中的零有效折射率带隙。

We also investigate and analyzed the property of the zero-band gap of the cantor structure.

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