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。
If we fire the individual photons and have detectors at the slit to find out which way each photon went the interference pattern disappears.
对于料位开关，检测器的支架总是高于放射源铅灌的支架。
For level switch, the bracket of the detector is always higher than the bracket of the shielding.
对于料位开关，检测器的支架总是高于放射源铅灌的支架。
For level switch, the bracket of the detector is always higher than the bracket of the shielding.
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