Sentence examples for and it is difficult to obtain from inspiring English sources

It should be noted that the criterion defined in (13) is a nonconvex function of, and it is difficult to obtain its global optimal solution.

Local data are scarce and it is difficult to obtain needed data in published reports.

Pulmonary artery sarcoma is a rare tumor, and it is difficult to obtain a definite diagnosis.

These methods need a relatively high temperature, and it is difficult to obtain nanocrystalline Co3O4.

Because Ps has a short lifetime and it is difficult to obtain low energy positrons in large numbers, dipositronium has not been observed unambiguously.

It can be described as a typical semi-structured decision-making and it is difficult to obtain a complete solution [4].

It is difficult to obtain figures for other countries.

It is difficult to obtain datasets for stroke patients.

However, it is difficult to obtain a tissue sample.

Likewise, it is difficult to obtain blood cultures from outpatients.

There were no reported deaths, but it was difficult to obtain information from the region.