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IELTS BNC: 15187 COCA: 13303

a short, solid piece of metal that moves up and down inside a cylinder in an engine to press the fuel into a small space and to send the power produced by it to the wheels(发动机)活塞

IELTS BNC: 15187 COCA: 13303
IELTS BNC: 15187 COCA: 13303
IELTS BNC: 15187 COCA: 13303
piston

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