英语就是准确啊！红色部分是我自己的理解。
OTT (Over the Top Technology) and IPTV (Internet Protocol Television) are two growing technology mediums(实际上就是两种机制) in the media（这个媒体指代媒体内容） distribution industry that are in place in the market（存在于市场中）, yet not being used to their full capacity by advertisers or the critical mass.
Both are systems(两种系统， 机制) through which television services（内容） are delivered using the Internet（都利用因特网）, instead of the traditional terrestrial（传统落后的天线）, satellite signal（传统落后的卫星信号） and cable television（传统落后的有线电视） formats. However there are several differences between the two, mainly that IPTV is delivered over a service provider’s own infrastructure（IPTV基于运营商自己的设施进行分发内容）, while OTT comes over the public Internet（OTT基于公用的因特网进行分发内容）.
Over-the-top content(OTT) describesbroadbanddelivery of video and audio without（在传输内容时候，OTT没有复杂的系统控制） amultiple system operatorbeing involved in the control or distribution of the content itself. The provider may be aware of the contents of theIPpackets but is not responsible for, nor able to control, the viewing abilities, copyrights, and/or other redistribution of the content（你我他， 路人甲均可以作为内容提供者）. This is in contrast to purchase or rental of video or audio content from an Internet provider, such aspay televisionvideo on demandor anIPTVvideo service（这点和IPTV的内容提供方式不同）, likeAT&T U-Verse. OTT in particular refers to content that arrives from a third party（他人， 别人， 第三方）, such asNowTV,Netflix,WhereverTV,Hulu,EmagineormyTV, and is delivered to an end user device(广大用户设备), leaving theISPresponsible only for transporting IP packets（把传输过程交给Internet）.
Internet Protocol televisionIPTVis a system through whichtelevisionservices are delivered using theInternet protocol suiteover apacket-switched networksuch as theInternet（IPTV也利用因特网）, instead of being delivered through traditionalterrestrial,satellitesignal, andcabletelevision formats（前面解释过， 此处不解释）.
IPTV services may be classified into three main groups:
live television, with or without interactivity related to the current TV show;（直播）time-shiftedtelevision: catch-up TV (replays a TV show that was broadcast hours or days ago), start-over TV (replays the current TV show from its beginning);（时移）video on demand(VOD): browse a catalog of videos, not related to TV programming.（点播）
IPTV is distinguished fromInternet television（IPTV和网络电视不同）by its on-going standardization process (e.g.,European Telecommunications Standards Institute) and preferential deployment scenarios in subscriber-based telecommunications networks with high-speed access channels into end-user premises viaset-top boxes（IPTV要用机顶盒）or othercustomer-premises equipment（或者其他的CPE。从上面的other可以看出， 机顶盒也是CPE的一种， 事实也正是如此）.
The main difference between OTT and IPTV is that though（表明后面的但是才是重点） both use internet, OTT streaming is delivered through open unmanaged internet（无限制的网）, while IPTV use a dedicated, managed network（有限制的网）.[1]
OTT has been gaining widespread popularity over the past two years with relatively low cost service providers likeNetflix,Hulu,myTVand many more, and provides more freedom, convenience and empowerment to users which gives a greater role for content providers to have a direct relationship with viewers（OTT是一个开放系统）.
总而言之， IPTV与OTT的in不同， System不同， out也不同， 看下面的图， 我就不多说了：
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