在外边界上统一应用适合于人工源的一阶吸收边界条件来形成边值问题，可减小基于平面波假设造成的人为截断边界的影响。
The first order absorption boundary condition is applied to the outside boundary, which can avoid the error caused by the plane wave assumption.
使用一阶TDMEI吸收边界条件可以充分发挥它与激励源无关的优点，减小计算量，同时保证一定的精度。
The proposed first TDMEI absorbing boundary condition could sufficiently exert the virtue of independence of source, reduce calculation and guarantee precision at the same time.
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