HSK 7-9
隆重
lóngzhòng形
grand; prosperous; ceremonious; solemn
学校隆重举行了建校纪念活动。
Xuéxiào lóngzhòngjǔxíng le jiànxiào jìniànhuódòng.
The school held a grand anniversary celebration.
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Appears across levels (7-9) in the HSK 3.0 word list.