不久以前，科学家还不得不亲自到图书馆去查阅文献，在那里他们只能一张张翻阅目录索引以便从各种满是灰尘的合订卷中找到他们需要的文章。
Not too long ago, scientists had to hoof it to the library to review the literature. And they had to flip through a card catalog to find that dusty old volume with the article they wanted.
不久以前，科学家还不得不亲自到图书馆去查阅文献，在那里他们只能一张张翻阅目录索引以便从各种满是灰尘的合订卷中找到他们需要的文章。
Not too long ago, scientists had to hoof it to the library to review the literature. And they had to flip through a card catalog to find that dusty old volume with the article they wanted.
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