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....
获得高水平的英语能力to gain a high level of competence in English使你的工作保持在高水平上.Keep your work on a high plane.为更高水平的游泳爱好者新建的25米长的游泳池受到了大家的欢迎。The new 25 metre pool for more serious swimmers is a welcome addition....
他们中的许多人置一己私利于集体利益之上。Many of them placed self-interest before the common good.蟾蜍把这整个地方都占为己有。Toads are colonising the whole place.爱邻如爱己。Love thy neighbour as thyself....