* **in that same region** - "in that area" or "near Bethlehem"
* **keeping watch over** - "taking care of" or "guarding in order to keep them safe"
* **flocks of sheep** - "groups of sheep."
* **at night** - This could be translated as "after the sun had set and it was dark."
* **an angel of the Lord** - This could be translated as "an angel from the Lord" or "an angel who serves the Lord" or "an angel who was sent by the Lord."