The repeated thrust applications at apoapsis would raise periapsis from inside to outside the stationary orbit.

重复点施推力，会将近点由同轨道内提升到同轨道外。

Now thrust could be generated (for “free” again) at periapsis, progressively increasing the altitude of apoapsis.

这「免费」近点产生推力，渐渐将点的高度提升。