Continuously variable transmission and cannon: what they have in common

1. Step 1. Continuously variable transmission — is a kind of — Transmission (gearbox). Stepless.
2. Step 2. Transmission (gearbox) — is part of — Tank. The transmission carries torque to the drive sprockets and lets the tank turn.
3. Step 3. Tank — has part — Tank gun. A gun in a rotating turret.
4. Step 4. Tank gun — is a kind of — Cannon. A gun.

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