Sentence examples for this has often proved from inspiring English sources

Unfortunately, this has often proved difficult.

The obvious remedy for treating bacterial infection is antimicrobials, however, this has often proven futile [ 5], and only a few combination regiments have reached to clinical practice.

While this prescription has often proved to be repeatable by trained observers, it admittedly has a "somewhat arbitrary aspect" (Ellis et al., 2009, p. 47), and some of the authors of this paper would argue that there exists scant empirical evidence for the presence of more than three consistently recognizable vein orders.

Looking back, this combination of circumstances has often proved disastrous for stocks.

This transition is the one that has often proved difficult elsewhere.

Locally, the effect has often proved limited.

Satisfaction has often proved elusive to Mr. Berry.

Yet finding the right candidate has often proved hard.

As a result, extending its provisions as they periodically expire has often proved difficult.

It would be rash to write the government off; Jaroslaw Kaczynski has often proved a masterly tactician.

India's government has often proved immutable to calls for progressive reform.