短語(yǔ)詞組短語(yǔ)run down a lead 按線索追蹤antenna down -lead 天線下引線down -lead metal core 引線金屬芯Down -Lead Specification 引線說(shuō)明internal down -lead 內(nèi)引線track down a lead 按線索追蹤welding of down -lead 引線焊接 返回 down lead