一阶声波方程波场模拟，采用的是交错网格，二阶精度，pml边界-A first-order wave equation of wave-field simulation, using the staggered grid, second order accuracy, pml boundary

采用的是规则网格进行的波场模拟，该方法是对一阶的声波方程进行的模拟，应用了二阶的精度 -Uses a regular grid for the wave field simulation, the method is an order of the acoustic wave equation simulation, the application of the second-order accuracy