Water wheel and air conditioner: what they have in common

1. Step 1. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
2. Step 2. Turbine — is part of — Gas turbine. A turbine.
3. Step 3. Gas turbine — has part — Compressor. A compressor.
4. Step 4. Compressor — is part of — Air conditioner. A compressor.

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