Polymer and tunnelling shield: what they have in common

1. Step 1. Polymer — is used in — UV/LED nail lamp. Gel polish is a liquid of monomers that link into a solid polymer under the light.
2. Step 2. UV/LED nail lamp — has part — LED. Modern lamps get their light from ultraviolet LEDs: the same semiconductor diodes as in a traffic light, just at a different wavelength.
3. Step 3. LED — is part of — Street light. LEDs.
4. Step 4. Street light — is part of — Tunnel. Lighting.
5. Step 5. Tunnel — uses — Tunnelling shield. Shield tunnelling.

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