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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.
How difficult is it for children to learn to speak two languages?
It may be difficult for patients to get the vital minerals they need from their diets, so ...
It is difficult to capture the anguish of the children of divorce, but when I read these lines by ...
(A) In hyperopia, light rays focus behind the retina, making it difficult to focus on objects at ...