"development difficulty" is correct and usable in written English.
You can use the phrase to describe a problem or issue encountered during the process of developing something. For example, "We encountered a development difficulty when trying to combine the two systems."
KW and KO could characterize reservoir water injection and development difficulty better than Kg.
It is an important index for measuring the development difficulty of the water resource.
The second one is the development difficulty coefficient of water resource.
In addition, factors of desorption, diffusion, and seepage network related to reservoir structure determine the development difficulty.
"Having a hearing or speech impairment or any other development difficulty should never be an obstacle to learning, going to school or participating in life of the society.
Although very effective for decades in clinical and agricultural use as broad-spectrum agents, widespread resistance development, difficulty in synthesis, and the emergence of the cephalosporins and the fluoroquinolones in the 1970s and 1980s relegated the use of the narrow- and expanded-spectrum tetracyclines to only a few indications.
The development difficulties were only part of the Incarna problem.
This would mean people being in much closer proximity to mines, with all of the environmental and development difficulties that entails.
Development difficulties delayed the launch of the next ISS element, Zvezda, a crew habitat and control centre similar to the Mir base block, until mid-2000.
Yet attention has increasingly focussed on the apparent increased radicalisation the couple underwent in the months before the assault on the Indland Regional Centre in San Bernadino, a facility that coordinates services for people with development difficulties.
Development difficulties was one barrier, as was making sure that everyone could join in easily.
