第二个模型称为长轮询：本文将讨论这一轮询模型—因为它以最快的速度响应服务器上的事件—以及一些需要克服的困难。
The second model is called a long poll: this article discusses this polling model-because it allows the quickest response to events on the server-as well as some hurdles to overcome.
国家森林服务人员说，截至4月11日，易燃的植被，无法进入的地区和强大的风力是900名消防队员在控制火灾中所需要克服的困难。
As of April 11, the fire-prone vegetation, inaccessible terrain, and strong winds had thwarted 900 firefighters working to control the fires, said CONAFOR.
你曾经需要克服什么困难来获得如今的职业成就吗？
Did you have to overcome any difficulties to reach this point in your career?
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