There are birds outside the window. If you listen carefully, you can hear their singing.
A hundred fifty million years ago, animals on earth, in order to fly up to the far sky. had changed their bone structure, two arms into wings, and decreased their weight to the maximum limit. Then they could fly to the sky.
Present day birds are descendants of those days.

Topic / Information

⇒ Beginners guide book “ Look far distance! ” is upgraded. PDF looking by P.C. is as follows.
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