However, in other instances the difference is difficult to explain.
Well... it's very difficult to explain to a child.
It's very difficult to explain in its present sense.
It's actually quite difficult to explain how it makes me feel.
A deadline difficult to explain, on a strictly medical level...
Un délai difficilement explicable sur un plan strictement médical...
It is much more difficult to explain and accept one's limits.
Il est bien plus difficile d'expliquer et d'accepter ses limites.
The contents are abundant and vast, difficult to explain in depth.
Les contenus sont abondants et vastes, difficiles à expliquer en profondeur.
Makes it all the more difficult to explain his little quirk.
Il est d'autant plus difficile d'expliquer sa petite bizarrerie.
With a mixture of pain and fear that's difficult to explain.
Avec un mélange de douleur et de peur difficile à expliquer.
It is sometimes difficult to explain problems over the phone.
Parfois, il est difficile d'expliquer un problème par téléphone.
Consequently, the linguistic situation is complicated difficult to explain.
En conséquence, la situation linguistique est très complexe et difficile à expliquer.
The mechanisms of these antagonisms were often difficult to explain by farmers.
Les mécanismes de ces antagonismes sont souvent difficiles à expliquer par les paysans.
All this to finally give a cocktail that can be difficult to explain.
Tout ça pour finalement donner un cocktail qui peut être difficile à expliquer.