HSK 7-9
茫茫
mángmáng形
boundless; vast and obscure
小船渐渐消失在茫茫海面。
Xiǎochuán jiànjiàn xiāoshī zài mángmáng hǎimiàn.
The small boat gradually disappeared across the vast sea.
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Appears across levels (7-9) in the HSK 3.0 word list.