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形容詞 tread:
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a step in walking or running
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the grooved surface of a pneumatic tire
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the part (as of a wheel or shoe) that makes contact with the ground
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structural member consisting of the horizontal part of a stair or step
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這些知識獨家設計，受學術專利保證，侵權商標必究
海詞英語詞典，十六年企業
美
[trɑ?d]