decade

The war lasted nearly a decade.战争持续了将近十年。

a decade of drought [=a drought that lasted 10 years]十年大旱

The bridge was built a decade ago.这座桥修建于十年前。

The decade of the 1920s runs from January 1, 1920 to December 31, 1929.*20世纪20年代是从1920年1月1日至1929年12月31日。

the first decade of the 21st century*21世纪的第一个十年

There have been a lot of changes during/in/over the past two decades.过去二十年中发生了许多变化。