当用户点击“+ 1”按钮，这个按钮能应用到他们所在的页面的网址。
When a user clicks on the + 1 button it applies to the URL of the page they're on.
一旦你的首个访问者点击了URL，那么你就隐式地进入了这样的一种协议中，即如果他们记住了来过该页面或是点击了刷新按钮话，那么他要看到相同的东西。
Once your first visitor hits a URL you’ve implicitly entered into an agreement that if they bookmark the page or hit refresh, they’ll see the same thing.
每一个朋友都会多少占用你一些注意力——你需要去看他们的更新，点击他们的页面，回复他们的留言，浏览他们的照片，等等。
And each friend will take up a little bit of your attention - when you read their updates, click on their links, reply to their messages, look at their photos, and so on.
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