HSK 7-9
轰
hōng拟声动
explosion; bang; boom; rumble
旧楼在爆破声中轰然倒下。
Jiù lóu zài bào pò shēng zhōng hōng rán dǎo xià.
The old building collapsed with a boom during demolition.
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Appears across levels (7-9) in the HSK 3.0 word list.