Sentence examples for difficult and requiring from inspiring English sources

The resulting empirical function, based on polynomial fits, was sufficiently flexible to describe the range of particle size distributions encountered in typical milling operations, but contained a high number of coefficients, making the interpretation of the physical significance of the coefficients difficult and requiring an excessive amount of experimental data.

People can then experience fluctuations in mobility, often unpredictably, making life very difficult and requiring more assistance.

Expressing was portrayed as similar to, but easier than, breastfeeding although at the same time difficult and requiring to be learned.

Early spring with high temperatures also means that no proper snow crust forms during the night, making migration more difficult and requiring more energy both from the reindeer and the herders.

The puzzles are brutally difficult and require patience, mathematical ability and keen observational skills.

It is enormously difficult and requires moving outside your own little way of seeing the world.

But the introduction noted that "the steps toward sovereignty and democracy will be difficult and require patience and time".

Establishing cause and effect in such an area is difficult and requires more scientific experimentation.

At this level, he says, the game is extremely difficult and requires monumental concentration, exquisite technique and instinctive brilliance.

Of course this is difficult, and requires commitments by western governments, of a kind which are so far appallingly lacking.

While it is certainly difficult and requires some planning, it is indeed possible to work and breast-feed.