The phrase "a practical illustration" is correct and usable in written English.
It can be used when providing an example that demonstrates a concept or idea in a tangible way.
Example: "To better understand the theory, let me provide a practical illustration of how it works in real life."
Alternatives: "a concrete example" or "a real-world example".
Results of approved HSS funding by the Global Fund to Fight AIDS, Tuberculosis and Malaria's (GF) and the GAVI Alliance are also presented as a practical illustration of applying the proposed framework in practice.
A practical illustration of nonlinearity is that Iran — or any other nuclear hopeful — needs increasingly few centrifuges to make uranium 235 increasingly potent.
A novel energy management assessment based on mapping of the overall process energy is introduced as a practical illustration to support the thermal energy integration.
Just as a practical illustration: to our knowledge, Xi Jinping has never met Kim Jong Un, and even the Chinese Ambassador to North Korea has yet to present his credentials to the leader.
The story of the two tropical windstorms is a practical illustration of the argument that there is no such thing as a "natural" disaster: the hazards are real, but the loss of life and property follows because people were not warned, or were warned but took no action, or were housed in dangerous structures.
A report published in July by an independent monitoring board for Berwyn, a body of volunteers who monitor prisoners' welfare, found that inmates there were "treated fairly and with decency," and said, "Berwyn will provide a practical illustration of what works well, what works less well and what can or should be discontinued". The report covered the period from March 2017 to February 2018.
This paper will present a generalised substructuring framework, using a practical example for illustration.
A practical example is taken up for illustration.
A graphical work flow chart and practical illustration of this method has been presented using two sets of examples.
The manuscript is well-written and nicely presented, with a good balance of descriptive text and discourse and practical illustration of package usage.
As practical illustration, the condition is applied to the turbulent hydrogen/air jet diffusion flames of Barlow and Carter 2, 3, 4.
