Sentence examples for is very difficult to attain from inspiring English sources
Fishes and invertebrates can also be maintained without filtration or aeration in aquariums that are "balanced" with plants; however, the balance between plants and animals is very difficult to attain on a large scale or even in a normally stocked aquarium, especially a seawater aquarium.
For him, knowledge is very difficult to attain, but ultimately within the reach of human beings.
Thus, it is very difficult to attain the same level of performance at this stage.
As observed with a large number of surfactants employed in NPs synthesis, it is very difficult to attain an efficient NPs cleaning, which is a fundamental requirement in catalysis researches.
First, representative sampling of MSM is very difficult to attain due to lack of a sampling frames and high levels of stigma.
This reflects the fact that optimal glycaemic control is very difficult to attain in a proportion of patients, even with relatively frequent and close contact with the clinical sites, and emphasizes the need for continued focus on insulin dose titration.
John McLaren, an economist and honorary professor at Adam Smith business school at Glasgow university, said: "It may be the first time there has been a negative tax take over a six-month period and means it will be very difficult to attain even that £700m figure, which itself is much revised down from a year ago".
It's very difficult to discover".
They're very difficult to make.
That might be very difficult to achieve.
