预约成功
concept
n.观念;概念;想法
例句：用作名词 (n.)
I can not understand such an abstract concept.
我无法理解如此抽象的观念。
He presented a new concept of the origins of the universe.
他提出了一种宇宙起源的新概念。
We had no concept that this tiny mistake would ruin the whole plan.
我们完全没有想到这个小小的失误会毁掉整个计划。
