HSK 5
大事
dàshì名
major event; major political event (war or change of regime); major social event (wedding or funeral); (do sth) in a big way
搬家是他们今年的一件大事。
Bān jiā shì tā men jīn nián de yí jiàn dà shì.
Moving is a major event for them this year.
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New in the HSK 3.0 word list at level 5.