HSK 7-9
凝固
nínggù动
to freeze; to solidify; to congeal; fig. with rapt attention
低温使瓶中的油凝固了。
Dīwēn shǐ píng zhōng de yóu nínggù le.
The low temperature caused the oil in the bottle to solidify.
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Appears across levels (7-9) in the HSK 3.0 word list.