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The platypus is very difficult to spot even on the surface of a river.
Staff members often find it difficult to communicate with other coworkers.
It may be difficult for patients to get the vital minerals they need from their diets, so ...
Propaganda to influence public opinion surrounds us, but most propaganda is covert, difficult to ...
It is difficult for Americans to grasp the depth of the poverty that is the everyday life of ...
(A) In hyperopia, light rays focus behind the retina, making it difficult to focus on objects at ...