HSK 7-9
环比
huánbǐ动
(statistics) period on period (i.e. "month on month" or "quarter on quarter" etc, depending on the context)
本月销量环比增长百分之五。
Běn yuè xiāo liàng huán bǐ zēng zhǎng bǎi fēn zhī wǔ.
Sales this month rose five percent from the previous period.
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Appears across levels (7-9) in the HSK 3.0 word list.