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....
declining soil fertility正在下降的土壤肥力A declining workforce has to provide for an increasing number of retired people.逐渐减少的劳动人口须要供养越来越多的退休人员。He shielded his eyes against the dazzling declining sun.他用手遮挡眼前落日耀眼的余晖。Official stat...
Cheap flights are available from budget travel agent from £240.收费低廉的旅行社可以提供240英镑起的低价机票。He worked in a travel agent's.他在一家旅行社工作。He works in a travel agent's.他在一家旅行社工作。...
打羽毛球时，我的跟腱撕裂了。Whilst playing badminton, I ruptured my Achilles tendon.跟腱断裂手术已经3个月了, 为什么一下雨就疼 呢 ?Rupture tendon operation already 3 months, why to rain to ache?自1964～1982年治疗16例跟腱断裂伤.From 1964 to 1982, 16 cases of achilles...