Seldom has a single concept played so important a role in mathematics as has the concept of function.

很少有一个概念象函数的概念那样在数学中起如此重要的作用。

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Seldom has a single concept played so important a role in mathematics as has the concept of function.

在数学中，很少有个概念象函数的概念那样，起那么重要的作用的。

youdao

Only after the rise of modern analysis in the early 19th century could the concept of function be extended.

只有在19世纪初期现代分析出现以后，函数的概念才得以扩 大。

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The concept of keeping donor organs at body temperature and preserving their function is also being tested in heart and lung transplants.

BBC: 'Warmed liver' transplant first