反粒子

When it does so, each particle of matter produced is accompanied by an appropriate antiparticle.

当这一过程发生时，生成的物质中的每一个微粒都存在一个相应的反粒子。

The antiparticle of the D?is indistinguishable from the D?

介子的反粒子同π°本身是无法区分的。

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电子，如同它有一个阳电荷一样，但是与电子的质量一样。

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。

However, although antiparticles can be and are created in the laboratory, this has never been done in sufficient quantity (less than one trillionth of a gram to date) to form what we would think of as antimatter.

然而，尽管反粒子可以而且已经在实验室中创造出来，却没有得到充足的质量（到目前为止所得仍小于一万亿分之一克）以形成我们所谓的反物质。

Antimatter is matter that is composed of the antiparticles of those that constitute normal matter.

反物质是由那些常态物质构成的反粒子组成的物质。

But there is no such thing as an antiphoton (photons are their own antiparticles, and are pure energy in any case), so that cannot apply here.

但是，没有反光子这种物质（光子是他们自己的反粒子，在任何情况下，都是纯粹的能量），所以这里并不适用这一原理。

A similar visualization works for CPT violation, but in this case the effects occur because particles and antiparticles have different couplings to the background fields.

同样的具象化也可运用在CPT违逆上，在此情形下，粒子与反粒子对于背景场有不同的耦合作用。

Antiparticles are created elsewhere in the universe where there are high-energy particle collisions, such as in the center of our galaxy, but none have been detected that are residual from the Big Bang, as most normal matter is [1] (http://science.nasa.gov/headlines/y2000/ast29may_1m.htm).

有高能粒子碰撞的宇宙其它地方产生了反粒子，例如在我们的银河中心，但是没有发现来自大爆炸剩余物质，如大多数常态物质是[1]。

The concept in PHYSICS that forms of matter may exist composed of antiparticles, opposite in all properties to the particles which compose ordinary matter, has a special appeal to sf writers.

物理中有个概念对科幻作家有独特的吸引力：物质可以由属性与组成物质的粒子完全相反的反粒子组成。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。