It turns out that the weak interaction causes a kaon gradually to convert into its antiparticle, the antikaon, and then back again.

弱作用会使k介子逐渐变成反粒子──反k介子，然后又变回来。

A Feynman propagator is constructed for the effective interaction between electrons which takes into account the polarizability of the medium of unexcited particles in the Fermi sea.

欲从理论完整了解蛋白质的稳定性及动性是一个战，这往往需要对摺叠非摺叠态的蛋白质之作用做具体的分析。