空心轴 空心轴的英文 英语翻译 hollow shaft; hollow spindle 拓展翻译 空心air core空心变压器air-core transforer空心波导hollow wave guide空心菜Ipomoea aquatica Forsk.空心导管hollow tubing conductor空心导体hollow conductor空心的hollowhollow; tubular空心电缆hollow cable空心断面open section空心反应器air-core reactor空心鼓筒hollow cylinder空心搅拌器hollow stirrer空心金属O型环密封O-ring closure空心抗流线圈air chock空心棱镜hollow prism空心棱锥hollow pyramids空心轮胎air tire; pneumatic tyre空心铆钉tubular rivet空心面包holey bread空心砂心吹制机hollow cvre blower