You cannot send a file because a file transfer is already in progress.

您无法发送文件，因为文件传输正在进行。

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Figures 3 and 4 below show the tweets generated by a file transfer starting and completing.

下面的图3和图4显示了一个文件传输开始和结束时所生成的tweet。

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A File transfer Protocol (FTP) is usually used to transfer or upload the web pages from a server.

一个文本传输协议(FTP)通常是用来从服务器转移或上传网页的。

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When I plugged a Linksys unit into an outlet near three light dimmers and a hair dryer, file transfer speed was cut in half, but dimmers or dryer alone brought the speed down just 25%, to roughly Wi-Fi rates.

FORBES: Home Networks: A Shocking Idea

Initially, the images meandered over the WiFi network -- taking 15 minutes to transfer a single 15MB file.

ENGADGET: Eye-Fi Pro X2 16GB Class 10 hands-on Hands-on

AirDrop, a peer-to-peer wifi file transfer feature.

FORBES: Apple: Live From The WWDC; OSX Lion, iOS 5; iCloud