Word: 概念 (gàiniàn)

我明白这概念。

Wǒ míngbai zhè gàiniàn.

I understand the concept.

我觉得你还没完全理解这个概念。

Wǒ juéde nǐ hái méi wánquán lǐjiě zhège gàiniàn.

I don't think you quite grasp the idea.

我觉得这个网站的概念非常好。

Wǒ juéde zhège wǎngzhàn de gàiniàn fēicháng hǎo.

I really like the concept of this website.

讨论这个问题的时候，应该对这两个概念加以区别。

Tǎolùn zhège wèntí de shíhou, yīnggāi duì zhè liǎng gè gàiniàn jiāyǐ qūbié.

When discussing this issue, one ought to distinguish between these two concepts.