en_tn/ecc/02/22.md

What profit does a man gain from all the work and from the striving of heart that he labors at under the sun?

The author uses a rhetorical question to cause the reader to think deeply about important things. Translate "what profit does a man gain from all the work" as you did in Ecclesiastes 1:3. Alternate translation: "A man seems to gain no lasting benefit from working hard and trying in his heart to complete his labors under the sun." (See: rc://en/ta/man/translate/figs-rquestion)

under the sun

This refers to things that are done on earth. See how you translated this in Ecclesiastes 1:3. Alternate translation: "on the earth" (See: rc://en/ta/man/translate/figs-idiom)