parallel bars

例句：

1. 1. The gymnastused parallel bars to perform a difficult routine.
   体操运动员使用平行杆完成了一个困难的表演。
2. 2. The painter drew parallel bars on thecanvas.
   画家在画布上画了平行线。
3. 3. The engineer measured the length ofthe parallel bars with a ruler.
   工程师用尺子测量平行杆的长度。