Hat e lead–acid battery: o que têm em comum

1. Passo 1. Hat — é feito de — Feltro. Felt.
2. Passo 2. Feltro — é material para — Piano. The hammers are covered with felt.
3. Passo 3. Piano — tem como parte — Keyboard. A keyboard.
4. Passo 4. Keyboard — faz parte de — Laptop. The keyboard is built into the laptop's case.
5. Passo 5. Laptop — tem como parte — Lithium-ion battery. A battery.
6. Passo 6. Lithium-ion battery — evoluiu de — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.

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