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The material used is Spring Steel of different grades.
所用的材料是不同等级弹簧钢。
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Stock elasticity or "spring back" of the material.
股票弹性或“弹回”的物质。
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Food material price remains stable ahead of Spring Festival.
春节来临，食品价格稳定。
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Food material price remains stable ahead of Spring Festival.
春节来临，食品价格稳定。
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