To say why such a phenomenon bothers certain people is rather difficult.
A common problem which is rather difficult to understand parents.
It is true that regional cooperation is rather difficult at the start.
Expressing himself in words is rather difficult for him.
Alcohol is rather difficult for the liver to process.
Some of this music is rather difficult.
Let's say, therefore, that the choice is rather difficult.
Digamos, por tanto, que la elección es bastante difícil.
However, to refuse to sit around with friends is rather difficult.
Sin embargo, rehusarse a sentarse con amigos es bastante difícil.
However, it is rather difficult to notice this different visually.
Sin embargo, es bastante difícil notar esta diferencia visual.
This exercise is rather difficult for beginners, but very effective.
Este ejercicio es bastante difícil para principiantes, pero muy efectivo.
Bivalves have a simple circulatory system, which is rather difficult to trace.
Los bivalvos tienen un sistema circulatorio simple que es bastante difícil de localizar.
It seems to me that the installation process is rather difficult.
Me parece que el proceso de instalación es bastante difícil.
The multiplication by cutting of these plants is rather difficult.
La multiplicación por esqueje de estas plantas es bastante difícil.