基本解释正电子, 氧电子同根派生 英汉例句Keywords positron annihilation lifetime of positro annihilation Doppler broadening of positron annihilation angular correlation of positron annihilation; 关键词正电子湮没;正电子湮没寿命;正电子湮没多普勒展宽;正电子湮没辐射角关联;