They're the voice in the driver's ear, guiding them through every lap. F1 drivers can't compete without their race engineers, but why are they so important?

Alfa Romeo's Zhou Guanyu and his race engineer Jorn Becker join Formula Why to answer your questions. Why do engineers speak like they do? Why do they use some words and not others? Why are all F1 Team Radio messages in English? Zhou and Jorn explain the secrets of a great driver/race engineer team. 

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