fifty
/ˈfɪftɪ; `fɪftɪ/ pron, det 50; one more than forty-nine 50, 五十（个）. =>App 4 见附录4. fifty, n
1 the number 50 *50; 五十.
2 the fifties [pl]
numbers, years or temperature from 50 to 59 从50到59的数目、 年数或温度
The total amount is in the fifties. 总共五十多个.
She was born in the fifties, ie in the 1950's. 她生於五十年代.
How warm is it today? It's in the (high/low) fifties. 今天气温有多少度? 五十几度（不到六十度[五十度出头]）.
3 (idm 习语) in one's fifties between the ages of 50 and 60 在50岁到60岁之间
She's in her early/mid/late fifties. 她五十刚出头[五十五岁左右/快六十岁了].