Simple, concise messages are difficult to extract from messy, complex data.
'I just thought: that one's for you.' The lows are more difficult to extract.
After all, as resources become scarcer or more difficult to extract, prices rise and demand falls.
The scientists found that coal in the region is getting more difficult to extract.
It is difficult to extract such a subtle competence in any way but a piecemeal fashion.
At high temperature, it is difficult to extract the inserted lithium.
It is difficult to extract quantitative information of pore space from thin section.
It is also very difficult to extract such information using direct air-borne acoustic measurements.
Lying hundreds of metres below the sea and deeper still below sediments, fire ice is exceedingly difficult to extract.
Duveen Brothers frequently owed Berenson large sums of money, which Berenson found very difficult to extract from the firm.
It can be difficult to extract all needed information from narrative paragraphs, even when they are well written.
