Spoke e gas lamp: o que têm em comum

1. Passo 1. Spoke — faz parte de — Umbrella. Ribs hold the canopy.
2. Passo 2. Umbrella — é feito de — Silk. The canopy is made of silk.
3. Passo 3. Silk — é material para — Hot air balloon. The Montgolfier balloon was fabric lined with paper.
4. Passo 4. Hot air balloon — tem como parte — Gas burner. It heats the air in the envelope with a propane flame.
5. Passo 5. Gas burner — faz parte de — Gas lamp. A coal-gas burner.

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