Thimble e Parafuso de Arquimedes: o que têm em comum

1. Passo 1. Thimble — é feito de — Bronze. Ancient thimbles were bronze.
2. Passo 2. Bronze — é material para — Propeller. Bronze does not rust in seawater.
3. Passo 3. Propeller — evoluiu de — Parafuso de Arquimedes. The first propellers by Smith and Ericsson were a variation on the Archimedes’ screw.

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