Sentence examples for prove difficult to replace from inspiring English sources

But after so many years at one of the capital's most influential institutions, Rosenthal will prove difficult to replace, said Sandy Nairn, director of the National Portrait Gallery.

Many thousands of insurgents, including the Qaeda chief in Iraq, Abu Musab al-Zarqawi, were captured or killed and proved difficult to replace.

He said a significant reduction in resources in 2013 led to the prison being destabilised by a large tranche of experienced staff leaving quickly, not least because it had proved difficult to replace them.

Just like the US Air Force's B-52, the Bear has proven difficult to replace – upgrades and refits are likely to keep these Cold War-era behemoths in the air until at least 2040.

Stay tuned for more... * difficult to prove, difficult to DISprove.

Negative results prove difficult to publish.

Legislation may prove difficult to enforce.

It is intended that SAAPdap will replace SAAPdb (which has proved difficult to update regularly and reliably).

The definition proved difficult to implement so in 1967, the definition was revised and the reference to the radiation source was replaced by defining the candles in terms of the power of a specified wavelength of visible light.

Genocide has proved difficult to prosecute.

The effect proved difficult to measure.