有的时候用Android市场搜索并安装应用程序很麻烦，而使用二维码是个快速而简便的选择。

Sometimes it can be a hassle to search for and install apps using the Android Market, but using QR codes can be a quick and easy alternative.

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这些通常能快速简便地进行安装和使用。

These are generally quick and easy both to install and use.

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为了快速，简便的安装一个插槽是在空心轴编码器，当它们对齐掩护模压标志规定，设置索引。

For fast, easy installation a slot is provided on the encoder hollow shaft, which when aligned to molded mark on cover, sets the index.

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