Much that is included in them has appeared in other published works, and one must dig hard for reliable new material.它们中包括的许多内容在其他已发表作品中都出现过了，所以必须要深入挖掘以找到可靠的新材料。He has not published anything for a long time.他很长一段时间没有发表作品了。Many writers in those days wrote under pseudonyms.那时候许多作家用笔名发表作品。University teachers must publish regularly to gain promotion.大学老师要获得晋升必须经常发表作品。