en_tn_lite_do_not_use/ecc/01/03.md

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

The author uses this rhetorical question to cause the reader to think deeply about important things. This question can be written as a statement. Alternate translation: "A man seems to gain no lasting benefit from all the work that he labors at under the sun." or "People seem to gain no lasting benefit from all the work that they labor at under the sun." (See: rc://en/ta/man/translate/figs-rquestion)

under the sun

This refers to things that are done on earth. Alternate translation: "on the earth" (See: rc://en/ta/man/translate/figs-idiom)