4:11a Again, if two lie down together, they will keep warm;

Also, if two people sleep ⌊close⌋ together, then they stay warm.
-or-
If two people sleep together, they keep each other warm. (Easy English Bible)

4:11b but how can one keep warm alone?

But how can a person who sleeps alone get warm? ⌊It will be hard/impossible.⌋
-or-
But if you sleep alone,it is difficult to be warm. (EEB)

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