81.I spent a whole week searching on the net,but came up with nothing valuable.
六级词汇讲解:
该句中的search on the net意为在互联网上搜索。其他与网络有关的表达还有:surfon the Internet、online game、online community 、netizen、netterlnettie/nethead、netuews等。come up with意为提出;想出，相当于think up。
英语六级考点归纳
come up的用法归纳。
comp up with意为提出;想出。如:
1)The scientists are beating their brains trying to come up with a solution to the problem.
科学家正绞尽脑汁，力求找到解决此问题的办法。
2)No one has come up with a convincing explanation of why dinosaurs die out.
尚未有人能对恐龙灭绝的原因作出一个令人信服的解释。
此外，come up with还有赶上的意思。如:
We shall have to work hard to come up with them.
我们得努力工作，赶上他们。