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The thickened artery wall narrows the channel through which the blood flows .
变厚的动脉壁使流通血液的管腔变细。
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A pipe or channel through which something flows.
水管，渠道，水槽：某物流动所通过的管道或渠道。
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A pipe or channel through which something flows.
水管，渠道，水槽：某物流动所通过的管道或渠道。
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