讨论了采用不同的电磁多极场作为动态校正器的可能性.推导了圆形校正透镜、偏转校正场和四极、六极校正场引起的附加象差的公式. The possibility of dynamic aberration correction by using electro - magnetic multipole fields is discussed.
英国的天气易变是有名的.The weather in Britain is notoriously changeable.我可以把他们易变的、不成熟的心灵雕塑成最适合我的工具.From their flexible and unformed minds I can carve out my fittest tools.西安 的天气很易变的.The weather in Xi'an is always changeable....