Therefore, file upload is a basic and necessary function of Web portals.
因此，文件上载是web门户的一种基本的必备功能。
It is extremely difficult for new entrants to enter the general web portals business.
这是极其困难的新进入者进入一般门户网站业务。
It is extremely difficult for new entrants to enter the general web portals business.
这是极其困难的新进入者进入一般门户网站业务。
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