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

以「免费」在近心点产生推力，渐渐将远心点的高度提升。

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

重复在远心点施以推力，会将近心点由同步轨道内提升到同步轨道外。

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

这时可以「免费」在近心产生推力，渐渐将心的高度升。

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

重复在心施以推力，会将近心由同步轨升到同步轨外。

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

这时可以「免费」近点产生推力，渐渐将点的高度提升。

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

重复点施以推力，会将近点由同步轨道内提升到同步轨道外。

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

这时「费」在近心点产生推力，渐渐将远心点的高度提升。

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

重复在远心点施推力，会将近心点由同步轨道内提升到同步轨道外。

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

这时可以「免费」在近心点力，渐渐将远心点的高度提升。

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

重复在远心点施以力，会将近心点由同步轨道内提升到同步轨道外。

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

这时可以「免费」在近心点产生推力，渐渐将远心点的高度提升。

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

重复在远心点施以推力，会将近心点由道内提升到道外。

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

这时可以「免费」近心点产生推力，渐渐将远心点的高度提升。

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

远心点施以推力，会将近心点由同步轨道内提升到同步轨道外。

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

这时可以「免费」在近心点产生推力，远心点的高度提升。

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

重复在远心点施以推力，会近心点由同步轨道内提升到同步轨道外。

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

这时可以「免费」在近产生推力，渐渐将的高度提升。

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

重复在施以推力，会将近由同步轨道内提升到同步轨道外。