“费城试验”是指美国于1943年秋天进行的一项试验。在试验过程中,“埃德里吉”号驱逐舰一开始突然消失不见,后来又突然在几百公里以外的海面上现出原形。专家们将这一著名事件称为20世纪最能吊起人们胃口的秘密之一,将它同肯尼迪被暗杀和1947年抓到“飞碟”并列称为三大秘密。除此之外,有人甚至认为,美国的这三大秘密之间有着某种联系。 “Philadelphia test ” refers to a test the United States conducted in the fall of 1943. During the experiment, the destroyer of “Edergi” suddenly disappeared from the beginning and suddenly appeared on the sea a few hundred kilometers away. Experts call this famous event one of the most delicious secrets in the 20th century that lifted people's appetite. It was juxtaposed with Kennedy's assassination and “Flying Saucer” in 1947 as the three major secrets. In addition, some people even think that there is some connection between these three major secrets in the United States.