HSK 7-9
沸腾
fèiténg动
(of a liquid) to boil; (of sentiments etc) to boil over; to flare up; to be impassioned
水开始沸腾后放入面条。
Shuǐ kāi shǐ fèi téng hòu fàng rù miàn tiáo.
Add the noodles after the water begins to boil.
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Appears across levels (7-9) in the HSK 3.0 word list.