“单元体”用英语怎么说？

画出此单元体,将应力标在其上.Draw a view of this element with the stress placed thereon.在B处的单元体,弯曲应力为零.The bending stress is zero for the element at B.现在从考察一无应力物体中的圆球形单元体开始讨论.We begin by considering a spherical element in an unstresse...