双杆用英语怎么说

双杆的英文：
parallels

parallel of latitude
纬度平行圈等纬圈黄纬平行圈

parallel of altitude
等高圈;地平纬圈

multiple parallel winding
复并联绕组

A tendon consists of parallel fibres.
腱由平行的纤维组成。

There are significant parallels with the 1980s.
与20世纪80年代有明显相似Lines of equal latitude are called parallels. 。