they are difficult

son difíciles

The problem is that they are difficult to measure.	El problema es que son difíciles de medir.
Only the fact that they are difficult to find.	Solo el hecho de que son difíciles de encontrar.
Some defects may be so severe that they are difficult to treat.	Algunos defectos pueden ser tan graves que son difíciles de tratar.
Although these features are visible, they are difficult and expensive to replicate.	Aunque estas características sean visibles, son difíciles y costosas de replegar.
There are wounds that cause pain, but they are difficult to locate.	Hay heridas que causan un dolor, pero son difíciles de ubicar.
Once they have developed they are difficult to treat.	Una vez que se desarrollan son difíciles de tratar.
The wheels of them were so large they are difficult to describe.	Las ruedas de ellos eran tan grandes que son difíciles de describir.
That's why they are difficult to lose weight.	Es por eso que son difíciles de perder peso.
As a consequence, they are difficult to detect.	Como consecuencia, son difíciles de detectar.
But they are difficult to qualify for.	Pero son difíciles de calificar para.
Too long, they are difficult to guide.	Demasiado tiempo, son difíciles de guía.
Too long, they are difficult to steer.	Demasiado tiempo, son difíciles de dirigir.
It is precisely because they are difficult that we must continue to show solidarity.	Y precisamente porque son difíciles, tenemos que seguir mostrándonos solidarios.
These are important because they are difficult to control.	Es importante porque es difícil de controlar.
Roots get deeply into the earth why they are difficult for digging out.	Las raíces penentran profundamente en la tierra, por qué es difícil excavarlos.
At other times they are difficult, complicated, distant.	Otras veces son difíciles, complicadas, alejadas.
Seeds of rhubarb are not advisable because they are difficult to grow.	Las semillas de ruibarbo no son aconsejables debido a que son difíciles de cultivar.
It is good to have these on hand since they are difficult to find.	Es bueno tener éstos en la mano puesto que son difíciles de encontrar.
However, they are difficult to date accurately.	Sin embargo, es difícil fijarles una fecha precisa.
Densely branched tendrils so tightly attached to the surface, they are difficult to detach.	Zarcillos densamente ramificado tan firmemente unidos a la superficie, que son difíciles de separar.