日常英语场景30篇（4）
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Bike Tune-up: Gears, Brakes, and Tire Pressure
自行车维修：变速、刹车与胎压调试
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I roll my bike into the repair shop and say 'Hi'.
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The mechanic checks tire pressure with a small gauge tool.
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He shifts through all gears to test smooth clicking sounds.
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He tightens the brake cables so levers feel firm.
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He cleans the chain with a soft brush and adds oil.
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He checks wheel alignment by spinning them slowly.
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He writes down what he fixed on my service slip.
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I test ride slowly in the parking lot before going home.