• 1. imaginary straight line: 假想直线 | 假想下线
• 2. imaginary straight line solution: 虚直线解
• 3. imaginary straight line solutions: 虚直线解

• 1.AXIS, an imaginary straight line or an actual physical component (such as an axle) around which a body can rotate.
  轴线，可让物体围绕着作旋转运动的一个想像的直线或实际存在的部件(如轴)。
  dict.yoduao.com
• 2.It turns around its axis, an imaginary line that goes straight through the middle of the earth from the North Pole to South Pole.
  它绕着自己的轴旋转；地轴是一条想像的穿过地球中央的、从北极到南极的线。
  dict.yoduao.com

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