http://www.youtube.com/watch?v=CXBFJ7pQ96g 10:19 necessity is the mother of invention
http://www.youtube.com/watch?v=FBkjI1rxe5k 2:34 necessity is the mother of invention
https://www.youtube.com/watch?v=eh3TgZ_V_S8 8:07 necessity is the mother of invention
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参考リンク
http://bridge-english.blogspot.jp/2015/02/born-out-of-born-of.html born out of = born of