莫大 (mò dà): greatest; most important

When she heard that her daughter had been admitted to her dream university, the mother felt immense relief and joy.

Having received help from friends at his hardest moment, he was filled with enormous gratitude.

The publication of this book is a tremendous encouragement to those who study Chinese history.

Winning the audience's recognition is a great honor for this young actor.

Losing a family member caused her tremendous pain, and for a long time she could not return to a normal life.