dirt bike
US /ˈdɜːrt baɪk/
UK /ˈdɜːrt baɪk/

1.
moto de trilha, moto off-road
a lightweight motorcycle designed for use on rough terrain, often in races or for recreation
:
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He loves riding his dirt bike through the trails.
Ele adora andar de sua moto de trilha pelas trilhas.
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They bought a new dirt bike for their son's birthday.
Eles compraram uma nova moto de trilha para o aniversário do filho.