en_tn_lite_do_not_use/mat/21/15.md

the marvelous things

"the wonderful things" or "the miracles." This refers to Jesus healing the blind and lame people in Matthew 21:14.

Hosanna

This word means "save us" but can also mean "praise God!" See how you translated this in Matthew 21:9.

the Son of David

Jesus was not David's literal son, so this may be translated as "descendant of king David." However, "Son of David" is also a title for the Messiah, and the children were probably calling Jesus by this title. See how you translated this in Matthew 21:9.

they became very angry

It is implied that they were angry because they did not believe Jesus was the Christ and they did not want other people praising him. Alternate translation: "they became very angry because people were praising him" (See: rc://en/ta/man/translate/figs-explicit)