Part 1 introduced Reverse Ajax, polling, streaming, Comet, and long polling.

The most common "true" Comet technique is a variant of polling called long polling.

最常见的“真正的”Comet技术是轮询的一种变体，即长轮询（long polling）。

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In long polling, however, a client would have an outstanding request to the server at any point of time.

然而，在长轮询中，一个客户机可能需要随时向服务器发送一个重要请求，因此，服务器再一次需要为每个客户机准备一个或多个线程。

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At this point you might be thinking that there is a major problem with both long polling and streaming.

至此，您可能会想，长轮询和流都有一个很大的问题。

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The main difference between polling and long polling is how long it takes the server to respond.

轮询与长轮询之间的主要区别在于服务器花多长的时间作出响应。

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This is similar to long polling in that there is no latency.

和长轮询一样，这种方式也没有延时。

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An alternative to this technique is long polling, which can avoid both these problems.

该技术的另一种方案就是长轮询，可以避免这两个问题。

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There are two basic types of polling channels, short and long polling.

有两种基本的轮询管道：短轮询与长轮询。

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Bayeux implementations support a specific HTTP method called long polling.

Bayeux实现支持一种名为长轮询的特定HTTP方法。

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Another common technique is long polling.

另一个常见的技巧是长轮询。

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For example an RTMP channel could be specified, but if that connection fails it could fail back to a long polling channel.

例如，可以指定RTMP管道，但如果该连接失败，就回到长轮询管道。

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In a long polling request, a client sends a request to a server to retrieve available information.

在长轮询请求中，客户机向服务器发出一个请求来检索可用信息。

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The dose problem is still the key issues which restrict the use of ancient formulas in today.

但是历年来“剂量是中医之不传之秘”，时至今日剂量问题仍然是羁绊古方今用的关键性问题。

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Perovskite-type ferroelectric thin films have received great attention as one kind of functional materials over the years.

钙钛矿型铁电薄膜作为一种功能材料，历年来都受到国内外学者的广泛关注。

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Over the years, the southeast coastal areas have been affected by the typhoon disaster frequently.

历年来东南沿海地区频遭台风灾害的侵袭。

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The Bermuda Triangle is famous for mysterious disappearances that have taken place there over the years.

百慕大三角因历年来频繁发生离奇失踪事件而闻名。

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The production, technical and economic indexes and waste heat utilization over the years are given.

列举了历年来江苏省硫酸工业的产量、技术经济指标和余热利用情况。

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There is economic uncertainty every year, but this year it seems to be especially virulent.

历年来美国的经济都充满了变数，但是今年以来其经济似乎病入膏肓了。

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The Report of the Investigations of the Human Intestinal Parasites in Henan Province from 1974 to 1980

历年来（1974～1980）河南省各地人群肠寄生虫调查报告

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Methods To analyze experience and lessons of reform of medical health work in recent years.

方法：分析历年来的医疗卫生工作改革发展的经验教训。

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For years Cooper has been demonstrating a healthy and strong financial momentum for continuous development.

历年来库柏都拥有着健康并良好的财务状况，这保障了库柏稳步持续的发展。

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