translation.en: Well, first there are strands of magnetic field left inside, but now the superconductor doesn't like them moving around, because their movements dissipate energy, which breaks the superconductivity state.
translation.zh: 首先呢，有几束磁场束会留在超导体里面， 但现在超导体不喜欢让它们在周围移动， 因为它们的运动会消耗能量， 这样会破坏超导体状态。