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这样也就有了电子和正电子的阴影。This creates, as it were, electron and positron shadows.

这将产生电子和正电子的阴影带，正如月亮阴影带本身。This creates, as it were, electron and positron shadows.

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接受正电子是艰难的第一步。It was a very difficult first step to accept the positron.

之后，电子与正电子对也最终在实验室中被制造出来。Later, electron and positron pairs were actually produced in laboratory experiments.

这两种成像方法均依靠精确的计算来决定正电子或光于发射的位置。Both rely on mathematical calculations to determine the location from which a positron or phot on was emitted.

本文用正电子湮没寿命谱学法研究石英片上LM皂膜的晶体质量。The quality of the LM soap film crystal is determined by means of the positron annihilation life spectroscopy.

正电子发射体层摄影术，或宠物，是核心脏成像，为最大限度地评估血流在心里。Positron emission tomography, or PET, is nuclear cardiac imaging for optimally assessing blood flow in the heart.

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氙气全身麻醉时对于人类局部区域脑代谢的正电子扫描图像研究。Positron emission tomography study of regional cerebral metabolism during general anesthesia with xenon in humans.

在室温条件下测量了吸收光谱与正电子湮没辐射多普勒展宽谱。Optical absorption spectra and positron annihilation radiation Doppler broadening were measured at room temperature.

布莱克特几乎是第一个发现正电子存在的有力证据的人，但他却没敢发表这个结果。Blackett was really the first to obtain hard evidence for the existence of a positron but he was afraid to publish it.

而建造产生正子的系统，以及将奈米大小的射束瞄准碰撞点，将会是最严苛的任务。Building the positron production system and aiming the nanometer -size beams at the collision point will be demanding tasks.

从使用较少数据的早期结果来看，正电子云似乎是呈球状位于银河中心。From earlier results using much less data, the positron cloud seemed to be spherical and centred on the centre of the galaxy.

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迪拉克预知正子的时候年龄稍大一点，正子是在哥本哈根聚会那年发现的一种粒子。Dirac was just a little older when he predicted the positron — another particle discovered the same year as the Copenhagen fest.

接著，反原子会遇到一个强电场，把束缚松散的反原子里的反质子及正子给拆开。Next the antiatoms encounter a strong electric field that strips apart the antiproton and positron of the weakly bound antiatoms.

一个正电子则是一个反电子，即与一个电子有相同属性的镜象粒子，只是其电荷性质相反即带正电荷。A positron is an anti-electron, a mirror-image particle with the same properties as an electron, but an opposite, positive charge.

举例来说，一个反氢原子，由带正电荷的正电子围绕带负电荷轨道运行的反质子组成。An atom of antihydrogen, for instance, is composed of a negatively-charged antiproton being orbited by a positively-charged positron.

即正电子放射断层摄影术，是一项成像研究，它能使医生评价大脑对某些物质的使用。PET, or positron emission tomography, is an imaging study that allows doctors to evaluate the use of certain substances by the brain.

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借助慢正电子湮没技术分析了样品的缺陷性质，采用纳米压痕仪研究了多层膜的力学性能。The vacancy-defect properties were measured by slow positron annihilation, and mechanical behaviors were studied using nanoindentation.

为处理复杂的正电子寿命谱，本程序可提供三种非线性最小二乘拟合方法。In the program, three kinds of nonlinear least-squares fitting methods were supplied for processing the complex positron lifetime spectrum.

在本文中推导了多指数函数模型在正电子湮没寿命谱拟合中的可用性。In this paper, the usability of multiple-exponential function model in fitting the positron annihilation lifetime spectrum is demonstrated.