HSK 7-9
居高不下
jūgāo bú xià(of prices, rates etc) to remain high
当地房租连续半年居高不下。
Dāng dì fáng zū lián xù bàn nián jū gāo bú xià.
Local rents have remained high for six consecutive months.
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Appears across levels (7-9) in the HSK 3.0 word list.