It's like how UFOs do not necessarily come from outer space, but are in hidden spaces in this world. That is why records of UFOs often speak of sudden appearances and disappearances. It is also possible that when UFOs emerge, because the pressure of the distortion of space is too great, they are completely destroyed.
就好像飛碟不一定來自外太空，而是在這個世界的隱藏空間裡，所以飛碟記錄中常有突然出現又突然消失的現象，也可能它出來時，因為空間扭曲的壓力很大，所以把它摧毀掉了。