导航从一个主页(a2)开始，遵循一个用例，然后提供返回到主页的导航。
The navigation starts from a home page (a2), follows a use case, and then provides navigation back to the home page.
这个Back按钮总是在需要从一个细节页面返回到主页面时使用。
This Back button is always used when a return from a details page to the main section is needed.
回到主页，思考一下你需要的东西，或者只是暂时逛一下首页都可以。
Get back to the homepage and think about what you're going to buy. Or you can just browse this page to find something great.
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