Sentence examples for often difficult to obtain from inspiring English sources

However, reliable comparative data, even for the world's greatest rivers, is often difficult to obtain.

Donations of blood, which are often difficult to obtain in war zones, "never caused us any trouble," the doctor said.

The FAO has pointed out that gaps remain in the provision of technical assistance to small-scale farmers and that finance is often difficult to obtain.

While often difficult to obtain in the most permissive of research environments, a good understanding of local research capacity plus a healthy dose of creativity can often create evaluation tools which are robust.

The usual blood screenings identify up to 75percentt of Down syndrome babies, but do not yield results until 20 weeks into pregnancy, when abortion is more dangerous for women and often difficult to obtain.

Such information is, however, often difficult to obtain experimentally.

Field estimations of soil water fluxes by 'classical' hydraulic methods are often difficult to obtain.

Moreover, it is often difficult to obtain the continuous velocity information of multi-agent systems.

It is often difficult to obtain adequate stabilization and normal bone growth by autogenous bone grafting.

When solving concrete problems, it is often difficult to obtain convergence.

For both MACE, the lightly doped silicon wafers are often difficult to obtain PSiNWs [22 27].