Wind turbine and sonar: what they have in common

1. Step 1. Wind turbine — has part — Electric generator. A generator.
2. Step 2. Electric generator — is part of — Geothermal power station. The turbine turns the generator.
3. Step 3. Geothermal power station — has part — Steam turbine. Steam from underground turns the turbines.
4. Step 4. Steam turbine — is part of — Destroyer. Turbines.
5. Step 5. Destroyer — has part — Sonar. Underwater acoustics.

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