When they are the same, their product is positive and the sum is increased.
当两个值相同时，它们的乘积就是正的，和就会增加。
Sum up experience in product research and development, continuously improve product performance and cost reduction;
总结产品研发经验，持续改进产品性能，降低成本；
Sum up experience in product research and development, continuously improve product performance and cost reduction;
总结产品研发经验，持续改进产品性能，降低成本；
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