发现 find; discover 发现一些线索 find some clues; 发现问题, 解决问题 discover problems and solve them; 发现敌炮艇一艘 spot an enemy gunboat; 划时代的发现 an epoch-making discovery; 考古学上的一项重要发现 an important archaeological find [discovery]; 发现人才, 使用人才 discover and employ qualified personnel; 发现规律 discover the law of ...; 敌机被我们的雷达发现了。 enemy planes were picked up by our radar. 哈维发现了血液的循环。 harvey discovered the circulation of the blood. 在实验中, 我们发现声音以不同的速度通过不同的物质而传播。 in experimenting we find out that sound travels with different velocities through different substances. 我没有发现什么情况。 i didn't notice anything. 发现机器有故障, 要及时排除。 if you find anything wrong with the machine, you should put it right at once
Silver compounds which became blackened by sunlight were known in the 18th century . 十八世纪人们业已发现银化物遇阳光会变黑。
Therefore , a study of incremental data mining algorithm is urgently needed . incremental data mining only modifies rule sets when database is updated , which takes advantage of previous calculation result and prevents knowledge extraction from the very beginning 把增量算法与数据库的更新结合在一起,渐增地进行知识的更新、修正和加强先前业已发现的知识,这样可以不必重新挖掘全部数据。