en_tn/ecc/04/09.md

And if two lie down together, they can be warm

The writer speaks of two people keeping each other warm on a cold night. (See: rc://en/ta/man/translate/figs-explicit)

how can one be warm alone?

AT: "a person cannot be warm when he is alone." (See: rc://en/ta/man/translate/figs-rquestion)