名词解释：copyright
A copyright is title to certain pecuniary rights and, in most countries, certain moral rights for a specified period of time.
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I would love ________ to the party last night but I had to work extra hours to finish a report.
_______ at all is worth doing well.
People appreciate _______ with him because he is knowledgeable and humorous.
To a worker, ________ from the point of view of society is necessary labor is from his own point of view voluntary play.
Theybuiltahighway_______themountains.
