These factors make it impossible to implement even a simple readline method without polling.
这些因素使得没有轮询就不可能实现甚至是简单的readline方法。
These are the features that are often difficult or impossible to implement using markup languages such as HTML or even DHTML.
这些特性通常很难或者根本不可能使用标记语言如HTML甚至是DHTML来实现。
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