Corrosion and telephone: what they have in common

1. Step 1. Corrosion — is used in — Titanium. Titanium resists corrosion thanks to an oxide film.
2. Step 2. Titanium — is material for — Cochlear implant. The case is titanium.
3. Step 3. Cochlear implant — has part — Microphone. A microphone.
4. Step 4. Microphone — is part of — Telephone. The handset microphone turns the voice into an electrical signal.

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