Sentence examples for proved difficult to attain from inspiring English sources

Agreement proved difficult to attain and meanwhile the internal political situation in Portugal deteriorated.

The MiData package is a useful tool enabling wide-scale research but it has proved difficult to attain satisfactory completion rates for some assessments.

A central causal role for CTCF/cohesin in establishing domain structure is widely hypothesized, but direct experimental evidence has proven difficult to attain.

However, this balance needs to be explicitly compared between Model 1 and Model 2. This comparison is important because in some cases it may prove difficult to attain a control of confounding from included covariates that is strictly equivalent between Model 1 and Model 2 if sufficient confounding amplification is to be achieved.

The episode proved difficult to make.

Neutrality proved difficult to maintain, though.

Alas, it proved difficult to find.

The latter aim proved difficult to enforce.

Spectacular early results proved difficult to sustain.

Genocide has proved difficult to prosecute.

The effect proved difficult to measure.