Well head e heat pump: o que têm em comum

1. Passo 1. Well head — faz parte de — Well. The part above ground that keeps out contamination.
2. Passo 2. Well — é feito de — Stone. The walls of wells were lined with stone.
3. Passo 3. Stone — é material para — Ice house. Ice houses were built of stone and sunk into the ground.
4. Passo 4. Ice house — evoluiu para — Refrigerator. The refrigerator replaced natural ice.
5. Passo 5. Refrigerator — funciona como — Heat pump. A heat pump is a refrigerator that heats the house.

Abrir Evothings