decade [ˈdekeɪd]

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n.十年，十年期

a period of ten years , especially a period such as 1860 to 1869, or 1990 to 1999

Prices have risen steadily during the past decade. 过去的十年间，物价一直在上涨。
The century has rounded into its ninth decade. 本世纪已进入了90年代。