这些功能主要由电子邮件系统、聊天服务以及文件传输工具来提供，以接近实时的速度传输数据、消息、音乐、图片和视频。
These are provided most notably by E-mail systems, chat services, and file-transfer facilities that offer nearly instant transfer of data, messages, music, photos, and videos.
这些功能主要由电子邮件系统、聊天服务以及文件传输工具来提供，以接近实时的速度传输数据、消息、音乐、图片和视频。
These are provided most notably by E-mail systems, chat services, and file-transfer facilities that offer nearly instant transfer of data, messages, music, photos, and videos.
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