现在虚拟门户的概念成为需求已有一段时间。
The concept of virtual portals has been a requirement for some time now.
我们想要传达的一个概念是：爵士并非是一段历史，而是活跃在当代的一种音乐。
We really did want to convey the idea that jazz is not a historical artifact.
临界段概念是为解决竞态条件问题而产生的。
To combat the issue of race conditions, the concept of a critical section was created.
这是一个大概念，所以允许我分成两段来讲。
This is a large concept, so allow me to butcher it into two paragraphs.
饭菜的流行时刻变化，但对营养学的基本概念应该保持很长一段时间，甚至是一辈子的事情。
Food fads come and go, but nutrition common sense can last a long, long lifetime.
他们提供了一段视频(Lockheed Martin)来解释这一概念，其中我可以确定大多数是伪造的，但让我们假装认为这都是真的。
They provide this video (below) to explain the concept, of which I'm pretty sure most of is fake, but let's pretend it's real.
该概念已经用于轮转印刷机中很长一段时间。
This concept is using in web press close loop for long time.
“虚拟水”的概念是对这一手段的补充。
This approach is complemented by the concept of "virtual water".
“虚拟水”的概念是对这一手段的补充。
This approach is complemented by the concept of "virtual water".
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