但是，等他拿到亚马逊给阅读器搭配的皮套，将其打开的时候，对开的皮套和《连线》杂志大小差不多一模一样。

But then he took the leather binder that Amazon sells to cover the reader and flipped it open. The folio fit the open pages of Wired almost precisely.

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针对开关磁阻电机存在磁场严重的非线性且数学模型不精确等问题，提出了一种滑模变结构控制方法。

Aimed at the nonlinear magnetic field and the imprecise model of switched reluctance motor, the variable-structure control method with sliding mode is presented.

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