Sentence examples for usually very difficult to from inspiring English sources

Unfortunately, the prior knowledge is usually very difficult to obtain.

In this method, controller design does not require a first principal model of the process which is usually very difficult to obtain.

Therefore, this method is usually very difficult to apply even for continuous-time switched linear systems [18, 19]; however, it becomes more complicated for switched nonlinear systems.

However, it is usually very difficult to study the systems in a higher-dimensional space unless they can be reduced to a two-dimensional space.

However, because most of these chambers are designed to maintain a thermally stable environment for the cells under study, it is usually very difficult to use them to study temperature-dependent cellular events.

Thus, correct and scientific decision-making is usually very difficult to achieve by only a single DM, because of time pressure and the limitation of the information-processing capacity, expertise, and experience.

The solution of these types of problems is usually very difficult due to their highly nonlinear, multidimensional and multimodal nature.

TBL relies on students to prepare and do their homework by themselves, but the neurology course materials are usually very difficult for them to understand, and it is even harder for students to build a clear and well-organized knowledge hierarchy.

Besides, it is usually very difficult, if not impossible, to measure external excitations under the operation condition of a structure.

In most of the engineering applications it is usually very difficult if not impossible to model nonlinearity theoretically, especially for nonlinear effects stemming from structural connections.

It is usually very difficult if not impossible to catch one of these.