谷歌对美国顶尖研究图书馆进行深度挖掘，为它能得到的所有著作制作数字副本。

That makes an effort by Google, to burrow deep into the leading US research libraries to make digital copies of all the works it can lay its hands on, seem both ambitious and quixotic.

youdao

在模拟世界里，复制是困难和退化的(即副本复制件比原本越来越差)，而在数字世界中，复制是高效和完善的。

In the analogue world, copying was difficult and degenerative (ie copies of copies became progressively worse than the original). In the digital world, copying is effortless and perfect.

youdao

实际上，它们是我对我的WordNet数据库本地副本的查询返回的索引数字。

Actually, they are the index Numbers returned by my query to my local copy of the WordNet database.

youdao