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汉语拼音：fǎn lì zǐ

除光子外，许多粒子都存在的另一种与其相对应的质量相同、平均寿命相同而电荷相反的粒子。如电子的反粒子是正电子，质子的反粒子是反质子。反粒子与其对应的粒子相遇时将发生湮没现象。

• 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。

• But this did not happen, there was a tiny deviation of one extra particle of matter for every 10 billion antimatter particles.

  但是，这并没有发生，有一个微小的偏差的一个额外的物质粒子，每百点零零零亿反粒子。

• At the quantum scale, virtual pairs consisting of a particle and its antimatter equivalent are constantly popping into existence.

  从量子层面来说，空间中一直不断出现由一个正粒子和与其对应的反物质组成的反粒子虚偶。

• That leaves CPT symmetry: the equivalent of what you would see if you watched a movie that starred antiparticles run backward in a mirror.

  最后，剩下CPT对称：就像如果电影里的演员是反粒子，然后你透过镜子，观看倒著放的电影。

• More than 200 subatomic particles have been detected so far, and most appear to have a corresponding antiparticle (see antimatter).

  至今已经检测到200多种亚原子粒子，大多数都有相应的反粒子。

• This property, often called " helicity , " serves to differentiate the neutrino from its antiparticle .

  这种性质通常称为“螺旋性”，可以用来区分中微子和它的反粒子。

• Some radioactive substances emit positrons, the antiparticles to electrons, and are used in PET (positron-emission tomography) scans.

  有些放射性物质会放出正子，它是电子的反粒子，已经应用于正子断层扫描（PET）。

• Particles and antiparticles could still collide, however, since gravitational repulsion is much weaker than electrical attraction.

  粒子与反粒子仍然存在碰撞的机会，因为万有斥力要比电极引力弱得多。

• DIRECT TESTS FOR CPT violation can be performed by comparing properties of particles and antiparticles .

  要直接测试CPT违逆，可以利用粒子与反粒子间的比较。