Sentence examples for are however difficult from inspiring English sources

There are, however, difficult questions to address.

The standards 2.1 and 2.2 are, however, difficult to achieve without a sound theoretical basis (standard 2.3).

Persistence, or dynamic changes in contact angle, are however, difficult to directly measure and incorporate into mechanistic conceptual and numerical models.

Detailed experimental measurements of the mixing dynamics are however difficult to obtain, and so predictive numerical tools are helpful in designing and optimizing many processes.

They are, however, difficult to obtain in sufficient quantities without causing complications in the donor site and a large amount of the transplanted grafts often get absorbed.

Most of these existing models are however difficult to apply to substrates they were not developed for since their applications are usually substrate specific.

It added: "The timing of the recovery is, however, difficult to predict.

It is, however, difficult to ensure that employers comply with the spirit of the law.

It is, however, difficult to imagine a John Woo movie about gold hunting ninjas not making it to multiplex screens everywhere.

How to identify the best research evidence is, however, difficult.

For other prepared samples, it was, however, difficult to find such regularities.