That means , in average , there is a extra proton or electron ( antiproton ) in 19100 neutrons .
也就是说，平均在19100个中子当中，要夹带一个过剩质子或电子（反质子）。
Antimatter particles are mirror opposites of normal matter particles . For example , an antiproton is a negatively charged version of the positively charged proton , one of the basic constituents of the atom .
反物质粒子与正常物质粒子镜像对立，正象组成原子基本成分之一带正电的质子与带负电的反质子的关系。
The wavelength of light used to force this jump can be placed into complex equations that reveal the mass of an antiproton to an unprecedented level of accuracy .
于是就可以把迫使这个反质子跳跃的光的波长放进一组复杂的方程组里，计算出精度极高的反质子的质量。
When a particle , such as a proton , meets with its antimatter partner , the antiproton , the two annihilate each other in a powerful explosion .
