Sentence examples for proved difficult to keep from inspiring English sources

The two fought through the night, a particularly difficult period for the prototypes when, after a spate of punctures last year, new, harder rubber proved difficult to keep up to temperature in the colder conditions, causing a loss of front-end grip.

But, according to the article, he grew increasingly uncomfortable with his career choice as it proved difficult to keep his private and NHS work separate.

Even so, it may prove difficult to keep unified support.

But it was proving difficult to keep track of such details as the lethal toll continued to rise.

Neutrality proved difficult to maintain, though.

Spectacular early results proved difficult to sustain.

Mr. Golub says that if a property has proved difficult to rent, the landlord may keep more desirable units unlisted until it has been.

The pledge has proved difficult to fulfil (because British emigration keeps dropping, and because European Union citizens cannot easily be kept out) and controversial (arguably the economy needs immigrants to grow).

The sabbath has never been easy to keep, but it has also proved difficult to lose.

Alas, it proved difficult to find.

Genocide has proved difficult to prosecute.