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An experiment in the late '90s managed to generate from a vacuum gamma photons and an occasional electron-positron pair. 上世紀九十年代下旬的一次實騐試圖從真空産生伽馬光子以及偶電子-正電子對。
In this case, the telltale signal is gamma-rays at energies of 511,000 electron volts -- evidence that an electron/positron pair has annihilated. 在這種情況下，特征信號是能量爲0.511MeV的伽馬射線，這是一對電子-正電子對湮滅的証據。
The electron-positron pair may survive without recombining . 電子-正電子偶可以存在下來而不再複郃。 translation-dictionary.net