Isotopes and shipping container: what they have in common

1. Step 1. Isotopes — is used in — Uranium. Uranium-235 and uranium-238.
2. Step 2. Uranium — is material for — Nuclear submarine. The fuel is uranium.
3. Step 3. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.
4. Step 4. Submarine — has part — Diesel engine. Diesel-electric submarines.
5. Step 5. Diesel engine — is part of — Container ship. A slow-speed diesel.
6. Step 6. Container ship — uses — Shipping container. Carries standard containers.

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