尽管这些语言可以提供更高的性能，但是生成的代码只能在有限的几种系统上执行。
Although such languages can perform at a higher level, the generated code can be executed on only a limited number of systems.
因为由语言(而不是操作系统)控制并发机制，所以生成数千甚至数百万个进程是很普通的。
Spawning thousands or millions of processes is quite normal, because the languages controls the concurrency mechanism not the operating system.
在后端系统使用编程语言并利用它们生成适合客户机的标记语言时，出现了大量问题。
A number of issues creep up when it comes to taking the programming languages everyone used for back-end systems and leveraging them to generate markup language suitable for a client.
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