Coin obverse and reverse faces e relógio atômico: o que têm em comum

1. Passo 1. Coin obverse and reverse faces — faz parte de — Moeda. Front and back with pictures.
2. Passo 2. Moeda — é feito de — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
3. Passo 3. Gold — é material para — Wristwatch. The case is gold or silver.
4. Passo 4. Wristwatch — é um tipo de — Mechanical clock. A wristwatch is a mechanical clock made small enough to wear.
5. Passo 5. Mechanical clock — evoluiu para — Quartz clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.
6. Passo 6. Quartz clock — evoluiu para — Relógio atômico. The quartz oscillator is tuned to an atomic standard.

Abrir Evothings