Sentence examples for difficult and firm from inspiring English sources

Unfortunately, limited data on this process in forest trees make delimitation of this threshold difficult and firm statements regarding hybrid persistence require more comparative studies.

"The issues relating to our China business are very difficult and complicated," the firm said in a statement.

"Lucas has played a critical role in helping the firm navigate through one of the most difficult and testing environments the firm has faced, particularly during the recent financial crisis and its aftermath," Mr. Blankfein said.

Lucas has played a critical role in helping the firm navigate through one of the most difficult and testing environments the firm has faced, particularly during the recent financial crisis and its aftermath.

I think that was important today, after the weather was difficult and the pitch was firm.

Because the study has as yet only been presented in abstract form, it is difficult and premature to draw firm conclusions already.

Given the wide variety of measurement techniques used, direct comparisons and firm conclusions are difficult to draw from the limited evidence available.

It remains difficult and costly for water firms to install meters in flats, though the industry is trying to develop more practical alternatives.

"Without question, this is the most difficult and challenging episode in our firm's history," the ads declared, describing the actions Andersen has taken so far, including the dismissals and reassignments of partners, as "tough decisions" that were "absolutely necessary and appropriate".

The lack of well-designed, randomized controlled trials and the heterogeneity of populations and study designs made the drawing of firm conclusions difficult and precluded performance of meta-analysis.

It is a problem that writers on China have encountered for years, and it can be difficult get firm evidence.