温故的英文：
reviewing knowledge already acquired

reviewing是什么意思：
n. 复查，重新考虑；回顾；检讨；书评，影评；检阅，阅兵式
v. 思考；回顾；写（书、影片等）的评论文章；复习

To receive review
接受检阅

The review is published quarterly.
这期刊每季度出版一期。

The book received a favorable review.
这本书赢得了好评。

knowledge是什么意思：
n. 知识；知晓；消息；理解范围

knowledge explosion
知识激增

knowledge of the victory
胜利的消息

They starve for knowledge.
他们渴望获得知识。

already是什么意思：
adv. 已经，早已

Have you already tested?
你测到结果了吗？

The girl already beached in Beijing.
那姑娘已在北京定居了。

They have already engaged that table.
他们已经预订了那张桌子。