HSK 7-9
翻番
fānfān动
to double; to increase by a certain number of times
新产品销量一年内翻番。
Xīn chǎn pǐn xiāo liàng yì nián nèi fān fān.
Sales of the new product doubled within a year.
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Appears across levels (7-9) in the HSK 3.0 word list.