Sentence examples for be difficult and often from inspiring English sources

However, the measurement of the magnetic moment of nanoparticles, nanoparticle virus-complexes or microspheres inanoparticle virus-complexesand orten yields unsatisfying or incomicrospheresults.

Differentiating structural isomers using gas chromatography (GC) and mass spectrometry (MS) can be difficult and often further structural elucidation is required.

Finding just a little hint that leads you on the right track can be difficult, and often a reference book, good article or an expert to speak to can be invaluable.

But currently, shopping for specific allergen-free or healthy products at grocery stores can be difficult, and often involves careful label-reading.

Gene pyramiding through conventional phenotype assays in breeding crops is considered to be difficult and often impossible due to the dominance and epistatic effects of genes governing disease resistance and the limitations related to all year-round screening (Sundaram et al. 2009).

They made what was referred to as "the 'never say never' proposition", that although securing a person's removal or deportation from Australia may be difficult, and "often it takes years of diplomatic negotiation before a country is prepared to accept someone... it is very hard to imagine a case where the purpose of removal or deportation is one that can never occur".

Compromised hardware is difficult, and often impossible, to detect.

Hence, evaluation of RTD in risers from conventional tracer responses is difficult and often not possible.

Travel, even for the young and healthy, was difficult and often dangerous.

Similarly, being a carer is difficult and often overwhelming in the best of situations.

He does as well as he can in school, but math is difficult and often frustrating.