Sewage treatment plant e rede elétrica: o que têm em comum

1. Passo 1. Sewage treatment plant — faz parte de — Sewerage. Treatment plants.
2. Passo 2. Sewerage — é feito de — Tijolo. The drains of Mohenjo-daro are lined with fired brick.
3. Passo 3. Tijolo — é material para — Power station. The buildings of the first power stations were brick.
4. Passo 4. Power station — faz parte de — Rede elétrica. Power stations feed the grid.

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