It is such a common rectangular blackboard, but it is the golden key to the door of the treasure house of knowledge.
就这样一个普通的长方形黑板，可却是通往知识宝库的金钥匙。
Outside reading is the supplement and extends of inside reading, and also another gold key to open the knowledge treasure-house.
课外阅读是课内阅读的补充和延伸，是开启知识宝库的又一把金钥匙。
Outside reading is the supplement and extends of inside reading, and also another gold key to open the knowledge treasure-house.
课外阅读是课内阅读的补充和延伸，是开启知识宝库的又一把金钥匙。
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