key concept的用法和样例：
例句
- The cardinal concept is that of the Tao, the ineffable, eternal, creative reality that is the source and end of all things.
道的主要概念，是不可说，永恒，创造性的实体，是万物的源头和终结。 - The main concept underpinning this programme encompasses matching insights from both Slovenian and international instructors, and a wide range of teaching methods.
主要概念支撑这个方案包括匹配来自斯洛文尼亚和国际见解教员，以及广泛的教学方法。
