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.
Marauding gangs of armed men have been looting food relief supplies.持械抢劫团伙一直在四处抢劫救济食品。A marauding tiger was often seen prowling around the village.经常看到一只猎食的老虎在村子周围悄悄走动.They went in fear of attack by marauding bands.他们提心吊...
Alf did this for over two years, and his fellow dustmen kept his secret.两年多以来,艾尔弗一直这样, 他的同事也为他保守秘密.The dustmen were busy clearing up the snow on the road.清洁工正在清除路上的积雪.Please distribute these brooms to the new dustmen.请你把...
Many phrases in the last two chapters echo earlier passages.最后两章中的很多说法是对前面段落的呼应。As we have seen in previous chapters, visualization methods are varied.我们在前几章已经了解到，可视化方法是多种多样的。The author devotes the first three chapters t...