Sentence examples for have proved impractical from inspiring English sources

But most technical improvements are incremental, and revolutionary "flying wing" airliners have proved impractical (they would involve strapping 300 people into an aircraft that flipped and zapped around like a fighter).

Normal cells often have proved impractical because they can only divide a limited number of times in culture, and once returned to the body they're often too old to do much good.

Established fishery-independent survey designs to measure change in the absolute density and biomass of greenlip abalone (leaded-line; LL) have proved impractical for the assessment of blacklip abalone.

Indeed, interventions in many health fields that have been found to be successful in efficacy studies have proved impractical to implement in applied settings that have limited time, few resources, and many competing demands [ 14, 15].

The company says the tools have proven impractical to keep up to date by themselves and a diversion from paid client work.

When it has proved impractical to spread into adjacent buildings or to construct annexes in the garden, branches have been installed wherever space can be found.

Almost the entire national team sought asylum in Germany after the Soviet invasion of 1979.In a country where even the central government must struggle to extend its authority beyond Kabul, creating a national football league has proved impractical.

To date, however, cryopreservation of cell sheets has proved impractical.

Goal Directed Therapy has been shown to improve outcome when commenced before surgery, but this approach has proved impractical.

But despite help from the police to implement the order, it has proven impractical.

The difficulty in finding suitable actors for the roles had led producer R. W. Goodwin to consider casting one actor in both roles and using special effects and body doubles to create the impression of twins; however, this idea was rejected as it would have proved too impractical and expensive.