SMTP e piston pump: o que têm em comum

1. Passo 1. SMTP — é utilizado em — E-mail. Sending mail.
2. Passo 2. E-mail — evoluiu de — Postal service. Electronic mail.
3. Passo 3. Postal service — utiliza — Steam locomotive. Mail trains.
4. Passo 4. Steam locomotive — tem como parte — Watt steam engine. A steam locomotive is driven by a steam engine.
5. Passo 5. Watt steam engine — evoluiu de — Piston pump. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.

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