请教，非常感谢。下面这段话不很理解,尤其不明白跟精度有什么关系?这是个很数学的问题，请懂帮我分析一下.非常感谢。
The FDTD algorithm is second-order-accurate by nature of the central-difference approximations used to realize the first-order spatial and temporal derivatives. This leads to a discrete approximation for the fields based on a uniform orthogonal lattice.
FDTD means finite difference time domain
of course the finite difference discretization will cause the error which is measured by the order of accuracy.
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