Hourglass neck e rede elétrica: o que têm em comum

1. Passo 1. Hourglass neck — faz parte de — Hourglass. A narrow neck sets the rate.
2. Passo 2. Hourglass — utiliza — Gravity flow. Sand pours through under gravity.
3. Passo 3. Gravity flow — é utilizado em — Water turbine. It is turned by falling water.
4. Passo 4. Water turbine — faz parte de — Hydroelectric power station. Water turbines.
5. Passo 5. Hydroelectric power station — é um tipo de — Power station. A kind of power station.
6. Passo 6. Power station — faz parte de — Rede elétrica. Power stations feed the grid.

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