Continuous track and laser: what they have in common

1. Step 1. Continuous track — is part of — Tank. Tracks let a tank cross trenches and rough ground.
2. Step 2. Tank — has part — Periscope. Observation devices.
3. Step 3. Periscope — has part — Mirror. Mirrors or prisms.
4. Step 4. Mirror — is part of — Laser. A resonator made of mirrors.

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