She explains that volcanoes are difficult to predict because they are complicated.
Unsettled weather makes it difficult to predict what will happen tomorrow.
However, the natural course of the disorder is difficult to predict.
The bandwidth needed for video connections is difficult to predict.
Her altering mood made it difficult to predict her reaction to the news.
It is difficult to predict what will happen in the future.
The latter, of course, is very difficult to predict.
But the true effects of the legislation are difficult to predict.
The future performance of share prices can be difficult to predict.
However, it's extremely difficult to predict when that might happen.
Cependant, il est extrêmement difficile de prédire quand cela pourrait arriver.
During this stage, cycles are very difficult to predict.
Pendant cette étape, les cycles sont très difficiles à prévoir.
It is very difficult to predict the time of that change.
Il est très difficile de prédire le temps de ce changement.
It's difficult to predict exactly how this will play out.
Il est difficile de prédire exactement l'effet que cela aura.