People should wear masks to prevent themselves from getting or contracting the virus and they should also wear a mask to go get the people that they’re around from getting the virus or contracting it
The imagery is “the sun shone brightly on them half the day” because its giving a better idea of what whatever they are talking about is like in the day
Paris, and the meaning behind this is to show that they both honor and respect each other. That their love will kill the pity they feel. Their love will last forever.