您要查找的是不是：
- Two of the three processes, photoelectric effect and pair production, eliminate the photons undergoing interaction. 三种过程中的两种，即光电效应和对产生，使光子受到作用后消失。
- Jentschke of the Deutsches Elektronen Synchrotron (DESY) about the possibility of doing a pair production experiment at Hamburg. 由反物质组成的宇宙到哪里去了？
- pair production of particle and its anti - particle 正反粒子对产生
- particle pair production and annihilation 粒子对产生和湮灭
- electron-positron pair production 电子对产生
- pair production of particle and its anti-particle 正反粒子对产生
- internal-conversion pair production 内转换偶产生
- pair production attenuation coefficient 电子对生成衰减系数
- She cast her eyes down to avoid direct eye contact. 她垂下双目以避免对视。
- I'll book you on a direct flight to London. 我将为你预订直飞伦敦的航班。
- He has chosen the most direct route. 他选取了最直的路线。
- She's very direct, believes in speaking her mind. 她为人直率，喜欢有什么说什么。
- Can you direct me to the shoe department? 请告诉我卖鞋部在哪里。
- Be there a direct train for Beijing to Nanning? 从北京到南宁有直达车吗？
- See that direct heat does not play on it. 当心别让它直接受热。
- It's a long way by road the train is more direct. 走公路很远--乘火车近。
- Would you please direct me to the zoo? 请问去动物园怎么走?
- My eyes were blinded by the direct rays of light. 在光线的直射下，我看不清楚东西。
- Her opinions are the direct opposite of mine. 她的意见与我的截然相反。
- She is in direct contact with the general manager. 她与总经理直接联系。
