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.
She acted in her firstfilm when she was 13 years old.13岁时她出演了她的电影处女作。The key issue was whether the four defendants acted dishonestly.关键问题是4名被告是否存在欺诈行为。A curtain acted as a divider between this class and another.帘子作为分隔物将这...
His remedial teacher sees signs of progress in his reading and writing.他的辅导教师发现了他在阅读和写作方面进步的迹象。Middle East peace talks in Washington showed signs of progress yesterday.昨天在华盛顿举行的中东和谈有了取得进展的迹象。There have been growing signs...
These vouchers are redeemable against any future purchase.这些优惠券将来购物均可使用。Vouchers must be redeemed before September 14th so you'd better get cracking to cash in.代金券必须于9月14日之前兑现，所以你最好快点。Shopping vouchers are often a g...