By "difficult," it is meant, I think, well, first of all that it is in some sense set apart from common speech, as a specialized and highly self-conscious use of language.
那么“难度”是什么呢？我看，第一点就是它那种特殊和高度自我意识的语言运用，让人感到与通常表达不一样。
Differentkinds of data structures are suited to different kinds of applications, and some are highly specialized to certain tasks.
不同类型的数据结构，适合不同类型的应用，有些是高度专业化的某些任务。
While some sporting equipment is general and has a huge market, other equipment is highly specialized and has niche markets.
一些体育器材很普通，却占有巨大的市场；而另外一些器材刚相当专业，市场占有率狭小。
While some sporting equipment is general and has a huge market, other equipment is highly specialized and has niche markets.
一些体育器材很普通，却占有巨大的市场；而另外一些器材刚相当专业，市场占有率狭小。
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