nineties
noun [ plural ] uk/ˈnaɪn.tiz/ us/ˈnaɪn.t̬iz/
B2 九十多岁（指90到99岁）
A person's nineties are the period in which they are aged between 90 and 99
She was well into her nineties when she died. 她去世时已年过九旬。
the nineties 九十多度（指90到99华氏度之间）
the range of temperature between 90° and 99°
Today it's supposed to get very hot - maybe up into the nineties. 今天预计会非常热，温度可能将高达华氏九十多度。
B2 九十年代
the decade (= period of ten years) between 90 and 99 in any century, usually 1990–1999
Bill Clinton was the US president in/during the nineties. 比尔·克林顿在九十年代／在九十年代期间是美国总统。