Sentence examples for are often difficult to propagate from inspiring English sources

However, there is evidence that some potential phytoextractors are often difficult to propagate.

N-Vinyl monomers that are typically amenable to free radical methods are often difficult to synthesize in a controlled manner to high molecular weight due to the lack of resonance stabilization of the propagating radical.

But they are often difficult to find.

Metaphors are often difficult to interpret.

Such systems are often difficult to solve.

DWMS are often difficult to fabricate, however.

Such forms of reasoning are often difficult to interleave.

Spatial patterns of soil moisture are often difficult to visualise as usually, soil moisture is measured at point scales, and often difficult to extrapolate.

Focal seizures are often difficult to treat, leading to pharmacoresistance.

They are often difficult to treat and recurrence is common.

Ectoparasites are often difficult to detect in the field.