Tablet film coating y semáforo ferroviario: qué tienen en común

1. Paso 1. Tablet film coating — forma parte de — Pastilla. A film coating.
2. Paso 2. Pastilla — se utiliza en — Aspirina. Produced as tablets.
3. Paso 3. Aspirina — está hecho de — Carbón. The raw materials of early pharmaceutical synthesis were products of coal tar distillation.
4. Paso 4. Carbón — es material para — Gas de hulla. The gas was made by the dry distillation of coal.
5. Paso 5. Gas de hulla — se utiliza en — Semáforo. A gas lamp lit the signal.
6. Paso 6. Semáforo — evolucionó de — Semáforo ferroviario. The first traffic light was a railway-style semaphore.

Abrir Evothings