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n.[物]正电子，阳电子
1、positive signs───n.（数）正号，加号（同plussign）
2、prepositions or adverbs───介词或副词
3、accusative preposition───宾格介词
4、transposition cipher───移位密码，错位密码；转置密码
5、depositories meaning───受托人含义
6、unfilled position───空缺职位
7、dominant position───支配地位；优势
8、chromite chemical composition───铬矿化学成分
9、brevet position───信息位置
10、deposit slip───n.存款单
1、Total cross sections for positron scattering on potassium were calculated at low energies by means of the coupled channels-optical method.───应用耦合通道光学势方法计算低能正电子同钾原子碰撞的总散射截面。
2、The result is that the electron shadow and the positron shadow are separated.───结果将使得电子的阴影和正电子的阴影被分开。
3、It was only in 1932, when the electron's antimatter sibling, the positron, was sighted in cosmic rays that such a thing was found to exist.───只有当1932年与电子相反的兄弟，正电子，在宇宙射线中被发现的时候，才证明这种物质的确存在。
4、Some of these gamma rays pass near atomic nuclei, in the process transforming into an electron and a positron, researchers said.───某些伽马射线在靠近原子核的附近经过，进入到转化为个电子和正电子的过程，研究人员说。
5、Positron emission tomography (PET) is an emerging modality in lung cancer staging.───正电子放射断层造影术(PET)是新兴的适用于肺癌分期的检查方法。
6、So, the antiparticle of the normal electron is called the positron, as it has a positive charge, but the same mass as the electron.───这样，正常电子的反粒子叫做正（阳）电子，如同它有一个阳电荷一样，但是与电子的质量一样。
7、Next the antiatoms encounter a strong electric field that strips apart the antiproton and positron of the weakly bound antiatoms .───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。
8、For instance, the antimatter opposite of an electron, known as a positron, is positively charged.───例如，电子的反物质就是带正电的质子。
9、was a very difficult first step to accept the positron.───接受正电子是艰难的第一步。
1、The Harvard group use positron emission tomography ( PET ) scans to monitor the brain activity.
2、Positron emission tomography ( PET ) is a non - invasive method to detect the distribution of radionuclide in vivo.
3、The electron - positron pair may survive without recombining.
4、The Positron lifetime spectra of unannealed and annealed Ni-coats, electro-plated from the four typical baths, have been measured.
5、The positron is an antielectron.
6、When an electron collides with a positron the two particles disappear, or annihilate, to create a high-energy photon.
7、The antielectron, or positron, was discovered in 1932.
8、This was confirmed by the positron annihilation technique.
9、Positron emission tomography imaging was performed to measure specific microvascular blood flow at rest and during pharmacological vasodilation by IV dipyridamole.