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俊英
塾の窓から見える風景
The students in the ninth grade are studying the similar figures now.
To solve the difficult question, using the theory of the balance is sometimes useful.

I didn't know the theory once.
When I wrote the article in my blog, I studied the theory a little deeply.
So I could teach it to the class.

To write my blog is useful for me.

晴れ
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