【ninety音标】 英[ˈnaɪnti] 美[ˈnaɪnti]
【单词释义】 ninety是什么意思：
num.九十
n.九十；九十年代；九十岁
adj.九十的；九十岁的
[单词分级] 中考英语词汇
[单词复数] nineties
【单词例句】
◇ Neglecting to use the safety key is one of the top mistakes Stevenson said treadmill users make. "Walking on a treadmill without a safety key is like driving without a seat belt," he said. "Ninety-nine percent of the time you won't have to use it, but when you need it, you really need it."
史蒂芬森表示，忽视对安全按钮的使用是跑步机用户最常犯的错误之一。他说：“在摸不到安全按钮的跑步机上走路就像开车不系安全带。99%的时候你都用不到安全按钮，但一旦你需要它，那就是真需要。”