Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
English Al-Mukhtasar tafsir for Surah Al-Mursalat — Ayah 21
فَجَعَلۡنَٰهُ فِي قَرَارٖ مَّكِينٍ ٢١
I then put that contemptuous fluid into a safe place i.e. the woman’s womb.