求翻译：根据我们对送样留存件检查，发现换挡机构在换挡过程中，噪音主要来源球头及拉索，下一步我们将对球头粗糙度进行改进，尽可能降低噪音，提高驾驶员操纵舒适度。是什么意思？

Send kind according to the US retained checks, shifting institutions found in the process of shifting, major sources of noise ball heads and cables, the next step we will improve on spherical roughness, minimize noise, improve driver handling comfort.