大事 (dà shì): important matter

I'm getting married next month; this is a major event for our family, and everyone is busy preparing for the wedding.

The company has decided to open an overseas branch next year; this is a top-priority major event concerning future development.

Scientists have discovered that this new virus could cause a global pandemic; this is a major event affecting human health.

For every student, the college entrance exam is a major event in life; it may change the direction of their future.

The president suddenly announced his resignation; this major event shocked the entire nation.