There is reasonable design of overflow slot.In order to swimmingly clean out dirt on surface, it needs enough area and the most axial length rate, to avoid overflow dead section.是什么意思_There is reasonable design of overflow slot.In order to swimmingly clean out dirt on surface, it needs enough area and the most axial length rate, to avoid overflow dead section.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句