Sentence examples for proved difficult to discover from inspiring English sources

The epidemiologic features of Campylobacter infection have proved difficult to discover, and extensive strain typing has failed to clarify the main transmission routes.

In the late 1800s the neuropathologist Karl Wernicke noted that damage to a specific region, the superior temporal gyrus (STG), also known as Wernicke's area, often resulted in problems comprehending speech a condition he named receptive aphasia.But exactly how the STG perceives speech has proven difficult to discover.

Alas, it proved difficult to find.

It was proving difficult to find.

The more recently discovered vestimentiferan tubeworms also proved difficult to understand, despite their greater size.

Genocide has proved difficult to prosecute.

The effect proved difficult to measure.

Yet reform proved difficult to implement.

The furlough plan proved difficult to enforce.

The advice proved difficult to follow.

Neutrality proved difficult to maintain, though.