Sentence examples for but this proved difficult from inspiring English sources
Their client Afghan forces also tried to secure the main roads between the cities, but this proved difficult.
In August, President Obasanjo ordered the military to crack down on delta militias, but this proved difficult as local militants put to great advantage their knowledge of the region's intricate network of creeks and swamps.
In September 1798, Wordsworth, Coleridge, and Dorothy travelled to Germany to explore proximate living arrangements, but this proved difficult.
The initial focus of the recovery was on finding and identifying human remains and on recovering the flight recorders, but this proved difficult, as the force of impact was "in the order of at least 350 g" meaning that the bodies of nearly everyone on the flight were fragmented and the environmental conditions only allowed the recovery of human remains along with the aircraft wreckage.
The original intention had been to interview carers of people whose care had been observed on the ward, but this proved difficult to arrange in practice.
Initially, we used a standard epi-fluorescence microscope (Nikon Eclipse E600 with mercury arc lamp system) but this proved difficult due to fluctuations in average power and so we used a modified microscope to give better control over the illumination.
But that proved difficult.
It has been conjectured for some time that the sudden energy release associated with secondary instabilities may initiate structural failure, but this has proved difficult to observe experimentally.
Other steps of gene regulation can be investigated by polysome extraction and RNA sequencing to determine the pool of RNAs that are under translation (associated with polysomes), but this has proved difficult to transfer between species, due to the need for extensive optimization [ 40].
But this distinction has proved difficult to maintain.
