On-line shopping is now accepted by more and more they think it more convinient to do And also they have the idea that the commodities are much cheaper than those in the department But some tend to suspect the quality of these the reason is that， perhaps ，they have experienced being cheated by those so-call world famous Mainly they don"t trust the quality and secondly they are afraid of not receiving what they pay Furthermore，no invoices can be gained，which makes some troubles when one finds poor quality In short， on-line shopping has advantage and it depends on people's concept of No one can say which is 第二篇With the development of the Internet and the popularization of computers， shopping on the Internet has become a commonplace in our Here consumers can buy almost everything they Shopping on the Internet has a lot of advantages， of which the most important is perhaps its People don't have to waste a lot of their energy and precious time to go from one shop to another to choose the commodities they This is especially desirable to the old， the sick and the busy people who cannot go to the shops in The goods come in all shapes， sizes and colors on the I All they need to do is to sit in front of their computers and click the The commodities they order will be delivered to them However， shopping on the Internet also has its The first disadvantage is that the consumers can't see the goods or try them on Sometimes， the real goods may not be the same as what they have seen on the The second disadvantage is that some shops on the Internet are not They will never deliver anything to you after they get the money from Once cheated， you will find that you have nowhere to go to
一般的论文查询网站的搜索范围更广，但是内容不一定是学术论文，根本无法准确定位。比如 IEEExploer， ISI Web of Knowledge 等网站的反应速度相比 Google scholar 慢，而且有时加载不出来。另外，ISI Web of Knowledge是收费服务，除了在部分高校校园内部，其他情况下基本无法使用。 google scholar是根据相关性的搜索结果进行排序，最相关的信息会显示在页面的最上方。而且，这个排序对应考虑了每篇文章的全文内容、作者、发表该文章的刊物，以及该文章被其他学术著作引用的次数等要素，上面的各种分析数据，在某些方面更有统计价值。还有，如果有正确的题目或者作者信息等，在可能的情况下google scholar会搜索全文，搜索效率非常高，搜索结果应该是非常全面的，并且绝大多数还提供了下载的链接，不用进入论文网站，方便操作能节省不少时间。 同时， google scholar只限定在学术上搜索，搜索结果链接到的都是数据库提供者或出版社的网页。因为不提供任何广告链接，所以学术纯洁性是非常高的。还有一点特别之处是，google scholar还包括了没有在线发布的学术研究结果。比如爱因斯坦的很多著作并未在线发布，但是却被很多学者引用。 总而言之，Google Scholar是一个专业性和功能性很强大，覆盖范围广泛，以及使用方便快捷准确的网站。
