双光子是在中性兀介子衰变中产生的.Two photons are created in the decay of the neutral pion.π介子构成另一种三重态, 只是电荷不同,其它方面均相同.The pions form another triplet, electrically different but otherwise alike.介子具有超荷性.Mesons have the property of hyperch...
Douglas was a 29-year-old journeyman fighter, erratic in his previous fights.道格拉斯29岁，是个技术不错的拳击手，在以前的比赛中发挥不太稳定。The man was known to the police because of previous convictions.因为有犯罪前科，警察们都认识这个人。CBS's ratings again sho...