HSK 7-9
忽冷忽热
hūlěng-hūrènow hot, now cold; (of one's mood, affection etc) to alternate
最近天气忽冷忽热容易感冒。
Zuì jìn tiān qì hū lěng hū rè róng yì gǎn mào.
The recent swings between hot and cold make it easy to catch a cold.
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Appears across levels (7-9) in the HSK 3.0 word list.