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MGM is introduced to solve field distributions in 3-D electron optical systems. The difference equation, the discrete form of Laplace's equation, is deduced in 3-D Cartesian coordinates. In view of the smooth effect, MGM combines Gauss-Seidel iteration with a technique known as coarse grid correction. Formulae for restriction and prolongation are deduced and expressed in terms of tensors.

将多重网格法引入电子光学系统中三维静电场的计算，对三维笛卡尔坐标系中的差分方程，采用高斯-赛德尔迭代法求解差分方程组，并结合迭代过程讨论了粗网格的误差校正技术；在不同网格层之间进行场值的限制和延拓，推导了三维静电场中的限制、延拓公式并以张量的形式表示。

The difference between a and b lies in...

a与b之间的差别在于。。。

Can you tell the difference between A and B?

你能区别A和B吗？

I don't quite understand the difference between A and B.

我不太了解A与B的分别。

That's the first difference between a beam of ordinary light and a laser beam.

这是第一个不同点在普通光束和镭射光束之间。

I am using it and it's made a good bit of difference.

我用它和它开了一个好一点的不同。

The difference between a wish and a burning desire is crucial.

愿望和炽热理想之间的区别是很关键的。

Here are ten tips that can make the difference between a pleasurable diversion and a full time job as an a cappella performer

以下是十个要点，从中我们可以看到一个自娱自乐性质的团队和一个专业的阿卡贝拉团队的区别。

It made a hell of a lot of difference.

它作了许多不同的地狱。

RESULTS:Among the 116 eyes, 94 eyes presented identical optometric results or less than 0.50D difference while 22 eyes had more than 0.75D difference after the instillation of the two agents, with 81.0% in agreement with the degree of spherical lens, with 92.2% in agreement with the compound hyperopia cylinder lens, with 84.6% in agreement with the axis of astigmatism.

结果：远视球镜度数116眼两次验光结果相同或相差≤0.50D者94眼，相差0.75D以上22眼，远视球镜度数符合率为81.0％，52眼复性远视柱镜度数符合率为92.2％，散光轴向符合率为84.6％，28眼远视年龄在8～12岁者，两次验光结果验光度数相同和相差≤0.50D，散光轴向≤5°者7眼，符合率25.0%，88眼年龄在12～16岁，符合率97.7％，≥0.75D者两例均合并有内斜视，本组两种不同散瞳剂散瞳验光结果对比远视球镜或复性远视柱镜度数相差0.75D以上者均为美多丽散瞳年龄≤12岁者或有斜视者，低于阿托品散瞳验光度数。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。