pitch drop experiment معنى"pitch drop experiment" أمثلة على "pitch" معنى "drop" معنى "experiment" معنى "oil drop experiment" معنى "pitch" معنى "pitch in" معنى "drop" معنى "drop in on" معنى "drop it" معنى "experiment" معنى "apply pitch to" معنى "be pitch-black" معنى "blade pitch" معنى "elevator pitch" معنى "football pitch" معنى "pitch (music)" معنى "pitch (resin)" معنى "pitch a tent" معنى "pitch angle" معنى "pitch black" معنى "pitch dark" معنى "pitch into the water" معنى "pitch invasion" معنى "pitch lake" معنى "pitch perfect" معنى أمثلة The pitch drop experiment has been running at the University of Queensland since 1927.
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