Then, using the second-order central difference to discretize the time derivative of the displacement, and applying the quadrature formula to the mass matrix, a fully discrete lumped mass Morley element method is developed for the same problem. 然后利用中心差分格式离散时间方向的二阶导数,再利用适当的求积公式得到薄板弯曲问题的集中质量Morley元全离散格式。