英语翻译Download performance is better with multi-source downloading.A peer can more easily utilize its whole download capacity with that.Because download and upload rates match each other,there must be peers on the network to provide all that do

英语翻译Download performance is better with multi-source downloading.A peer can more easily utilize its whole download capacity with that.Because download and upload rates match each other,there must be peers on the network to provide all that do
英语翻译
Download performance is better with multi-source downloading.A peer can more easily utilize its whole download capacity with that.Because download and upload rates match each other,there must be peers on the network to provide all that download bandwidth with their upload capacity.And that’s why the whole system can have better download performance if other peers provide more resources to the system by uploading.Incentive mechanisms are used to courage for that and NAT Traversal helps to utilize resources of the NATed peers.Asymmetric broadband connections with lower upload capacity than download capacity make things more problematic.Upload capacity of the whole system might not be sufficient to satisfy full download rates of individual peers.
BitTorrent is the leader in download performance due to its advanced download distribution protocol.BitTorrent is focused to the download process and there is no search functionality through the overlay network.Examined P2P protocols still have very similar download techniques.Downloading/uploading is done out-of-band of the overlay network directly between end nodes (considering BitTorrent doesn’t have real overlay network in that sense).All of the examined protocols support simultaneous downloading from multiple sources,but FastTrack and basic Gnutella (excluding e.g.LimeWire) don’t support sharing of partially downloaded files.Peer selection algorithm (choosing among group of peers where to download pieces of the content from) has some effect on download performance.A good peer selection algorithm satisfies better peer’s download capacity.Peer selection algorithms are often client software specific.With the BitTorrent uploading/sharing pieces of a file is done very effectively compared to the others.ED2K and Overnet queue-based scheduling of download with waiting times sometimes exceeds a few days for the lowID peers.As Overnet uses Multisource File Transmission Protocol (like ED2K),there shouldn’t be big differences with Overnet and ED2K in download performance.
According to [PGES05],the average download speed of BitTorrent peers was 240 Kbit/s.According to [IUB+04],the download speed of single-session BitTorrent download was 1.3 Mbit/s and average for all sessions was 500 Kbit/s.According to [SGP04] the average download speed for all BitTorrent peers is quite high,being around 200 Kbps.
BitTorrent,ED2K and Overnet is especially well suited for large files.BitTorrent is not good for the small files,because of overhead.FastTrack and Gnutella suit well for transferring small files,because searching time is essential to the overall performance with small files.

英语翻译Download performance is better with multi-source downloading.A peer can more easily utilize its whole download capacity with that.Because download and upload rates match each other,there must be peers on the network to provide all that do
多资源下载使得下载的效果更佳.在多资源下载的情况下,用户可以完全地发挥下载能力.因为下载和上传速率是彼此相关的,是用户们上传能力提供了下载带宽.这也就是为什么当其他用户上传更多资源时,整个体统能够提供更好的下载服务的原因.现在,人们用一些奖励机制来鼓励用户更多地上传数据.与此同时,网络地址转换也让使接入网络的用户所提供的资源更好地得到运用.是上传能力弱的不匀称宽带接入而不是下载能力导致下载不尽如人意.也就是说是整个系统的上传能力不能满足全速下载的要求.
而BT下载,由于其先进的下载分布协议,成为了下载领域的领导者.BT注重下载进程而不会对整个网络进行搜索.而现行的点对点协议则仍然使用的是十分相似的下载技术,即下载和上传都在带宽之外的网络的不同节点之间直接完成（考虑到BT没有真正意义上的覆盖网络）.所有的现行的点对点协议都支持从多资源同步下载.但是FastTrack和Gnutella（LimeWire除外）都不支持部分分享下载文件.用户选择算法（从用户组中选择从何处下载某段资源）对下载有一定的影响.优秀的用户选择算法能提高用户的下载能力,而用户选择算法往往具有是客户软件的特性.和其他软件比起来,BT对文件的上传和下载都是非常高效的.而电驴和Overnet基于“排队”机制的下载可能让一些低端IP的用户登上好几天才能开始下载.因为Overnet和电驴一样都使用多资源文件传输协议,这两种软件的下载效果不会有太大的差别.
根据【PGES05】,BT用户的平均下载速度是240KB每秒.根据【IUB+04】,单期的BT下载的速度为1.3兆每秒,而全期平均下载速度是500KB每秒.根据【SGP04】,所有BT用户的下载速度都很快,大概在200KB每秒左右.
BT,电驴,Overnet尤其使用于下载大型文件.因为总开销的缘故,BT不适合下载小文件.而FastTrack和Gnutella都很适合小型文件的传输,因为对小型文件下载而言,（资源）搜索时间是十分重要的.
注：由于精力及手头资料有限,对诸如：
Overnet等一些商业名词 和NAT Traversal,overlay network,single-session等专业名词
的翻译可能不尽如人意,希望您多多包涵并且麻烦您可以进行进一步精确查证（相信你要这篇文章的翻译,你也应该对计算机有相当的了解吧）.
最后,“纯手工”打造哦!^-^

好长