采用频率响应特性分析方法，对典型变数据窗阻抗算法的频域特性以及滤除非周期分量的能力进行了综合比较和分析。

The frequency performances and dc-offset rejection abilities of several typical variable-window algorithms are evaluated and compared based on the frequency-response analysis method.

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一个典型的购物车会显示用户浏览站点时加入的产品列表，可以改变数量的输入栏，结帐按钮等等。

A typical shopping cart shows a list of products that the user added to it while browsing the site, input fields to update quantities, buttons to proceed to checkout, and such.

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