The returning light beams merge together at the beam splitter and create an interferencepattern of light and dark regions where the light waves either cancel out or reinforce each other.
返回的两束光在分束器处汇合，产生由亮区和暗区组成的干涉图案，图案中，光波要么相互抵消要么相互增强。
2
If we fire the individual photons and have detectors at the slit to find out which way each photon went the interferencepattern disappears.
如果我们在放射单光子的时候有检测器在缝的旁边，就会发现每一颗光子的去向，相互干扰就会消失。
3
Somehow the photons still end up, ending up on the screen in an interferencepattern.