Sentence examples for proved difficult to prepare from inspiring English sources

The technique "offers a very creative approach to growing crystals of membrane-bound proteins that, in the past, have proved difficult to prepare," says Eric Gouaux, a Columbia University protein crystallographer.

Anything longer proves difficult to prepare.

The episode proved difficult to make.

Neutrality proved difficult to maintain, though.

Alas, it proved difficult to find.

Genocide has proved difficult to prosecute.

The effect proved difficult to measure.

Yet reform proved difficult to implement.

The furlough plan proved difficult to enforce.

The advice proved difficult to follow.

The latter aim proved difficult to enforce.