You might add classes for processing the BookPool.com navigation tree on the left side of the home page, for processing the shopping cart and checking out, or even simply for reading the source HTML.
您可能要增加一些类，处理主页左边上的 BookPool.com 的浏览树。
We can also use our smart phones as a tool for shopping and reading so that we are freed from driving to the supermarket or carrying heavy books with us.
我们也可以使用智能手机作为购物和阅读的工具，这样我们就从开车去超市或者携带厚书这样的事情中解脱出来。
Instead, you know you should be doing useful things like reading, cleaning your garage, or grocery shopping.
其实自己也知道应该做些有用的事情，比如看书，打扫车库或去商店买些生活必需品。
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