求翻译：1.从所收到的不良品看，该不良品为我司2月份所送样品，该样品在今年5月份贵司所做的冷反应测试中NG，我司于6月份对该产品结构进行优化后重新送了一次样品，优化后样品是否也存在类似问题，如有相关样品，请帮忙寄回我司进一步分析改善，改善前和改善后样品差异如下：是什么意思？

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1. from by received of bad products see, the bad products for Division I February by sent samples, the samples in this year May your division by do of cold reaction test in the NG, Division I Yu June on the products structure for optimization Hou again sent has a times samples, optimization Hou samp