moment of inertia of cross-section

例句：

1. 1. Thecar's moment of inertiais high, so it takes time toaccelerate.
   这辆车的惯性力矩很高，所以需要时间才能加速。
2. 2. The momentof inertia is important for understandingthe motion of objects.
   惯性力矩对于理解物体的运动非常重要。
3. 3. The engineer calculated themoment of inertia of the newdesign to ensure stability.
   工程师计算了新设计的动力矩，以确保稳定性。