英语语法分析

In the medial tract, the multifidi originates on the sacrum.

在内侧束，多裂肌起源于骶骨。

The longissimus thoracis originates on the back of the sacrum.

胸长肌起源于骶骨后部。

Najash retained a sacrum, a bony feature that supported the pelvis.

Najash蛇保留着骶骨，用它来支撑骨盆。