For example,after a user visits the National Weather Service site to check on the progress of a hurricane,and calls to a colleague to take a look for himself,this second user will get to see the satellite picture almost instantly.

• 例如，一个用户访问了国家气象局的站点，查看某次飓风的动向，并告诉同事自己去看一看，第二名用户几乎立即就能看到卫星图像。