When the design of reducing vibration for a real structure is carried out, the case that the excitation on the structure is unknown is often met.

对实际结构作减振设计时，经常遇到结构激励源未知的情况。

youdao

This way, you can observe the actual structure and behavior of a real system, by walking around it and viewing it from any Angle in a virtual world.

这样，您就可以通过在虚拟世界中在真实系统周围走动并从某个角度进行查看，从而观察真实系统的实际结构和行为。

youdao

The virtual stack -- like a real stack -- is a last in-first out (LIFO) data structure that temporarily stores function arguments and function results.

虚拟堆栈与实际堆栈类似，是一种后进先出（LIFO）的数据结构，可以用来临时存储函数参数和函数结果。

youdao

We're talking about an actual (well, artificial) cloud that promises to be both a real structure and a massive digital display.

ENGADGET: Digital 'Cloud' could form over London for the 2012 Olympics

While the capital raising efforts were viewed by some as a way to provide stability to the company, there was also concern that those benefits could be offset by Thornburg's corporate structure as a real estate investment trust and continued weakness in the mortgage securities market.

FORBES: Thornburg Mortage Saves Itself

Similarly, there is a very real risk that the penalty structure to enforce the employer mandate under Obamacare may have very perverse incentives for firms below 30 workers and 50 workers to stay below these thresholds.

FORBES: Will Obamacare Stimulate Entrepreneurs?