0947番組の途中ですがアフィサイトへの転載は禁止です (ﾜｯﾁｮｲW fa5d-0I0T)
2023/02/26(日) 23:36:03.09ID:C8oasxkb0英語版wikiにこう書いてるわ
Temperingは焼き戻しって意味ね
> Tempering is an ancient heat-treating technique. The oldest known example of tempered martensite is a pick axe which was found in Galilee, dating from around 1200 to 1100 BC.[5] The process was used throughout the ancient world, from Asia to Europe and Africa.
だから恐らく中国でも実施されてるだろこんな技術さ
