The idea is attractive. But even when prototypes exist, they rarely become the default way people work. And by dissecting why, implementation constraints get blamed (UI toolkits, graphics layers, performance), and some of that is surely real—but I think the deeper reason is simpler:
（一）货物的品名、标志、包数或者件数、重量或者体积，以及运输危险货物时对危险性质的说明；
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Pre-orders for the M4 iPad Air are now open. The tablet will hit retailers in 35 countries and regions on March 11. It will be available in blue, purple, starlight and space gray.，更多细节参见下载安装汽水音乐
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