[lemma=□]
[lemma=difficult]
How difficult it must for an old man like yourself to change your way of life , let get out of your chair , or even type things on old , frail hands . And if you thought that devising new components and subsystems for this first-ever reusable space vehicle was difficult at the onset , there 's an argument to be made that repairing , maintaining , and improving the Shuttle is even tougher . To help answer difficult scientific questions about blue crab growth and behavior , Maryland Sea Grant is now funding a project on spatial stock dynamics of blue crab . " They are particularly difficult in organizations like ours - where employees are passionate about the work they do . When writers or editors in an organization see SGML as just an added task that makes their day-to-day work more difficult , the political infighting that might occur could cause the entire project to fail .