diungkapkan

In a sentence

• Rasa syukur diungkapkan oleh siswa kepada gurunya.

  Gratitude was expressed by the student towards their teacher.

  Here, 'diungkapkan' is used in a passive voice construction to indicate that gratitude ('rasa syukur') is being expressed.

• Terima kasih telah diungkapkan dalam pidato yang menyentuh hati.

  Thanks were expressed in a touching speech.

  In this sentence, 'diungkapkan' describes that thanks ('terima kasih') were expressed during the speech, again in passive voice form.

• Kebenaran akhirnya diungkapkan setelah penyelidikan panjang.

  The truth was finally revealed after a long investigation.

  Here, 'diungkapkan' implies that the truth ('kebenaran') was made or brought forth, denoting a revealing action in a passive context.