dorsal chord

例句：

1. 1. The dorsal chord is the main part of the animal's body that supports its back.
   背侧弦是动物身体的主要部分，支撑着它的背部。
2. 2. The dorsal chord plays a crucial role in the animal's movement and balance.
   背侧弦在动物的运动和平衡中起着至关重要的作用。
3. 3.The dorsal chord is made up of several different muscles that work together to support the animal's body.
   背侧弦由多种不同的肌肉组成，这些肌肉共同工作以支撑动物的身体。