jreibun/5107/2
- き木 と
- き木 を高速で
- すりあ擦り合わせる と、
- まさつ摩擦
- ねつ熱 が
- はっせい発生 し、
- ひだね火種 を作ることができる。
When two pieces of wood are rubbed together at high speed, frictional heat is generated, creating an ember that can be used to start a fire.
— Jreibun
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