三十九;
例句:
Thirty-nine-year-old 39 year-old Denise Harris is helping researchers gain a better understanding of the brain.
39 岁 的丹尼斯·哈里斯正在协助研究人员更好地了解大脑.
Yue Fei died at thirty-nine years of age.
岳飞死的时候才 三十九 岁.
The temperature here sometimes goes up to thirty-nine degrees centigrade.
这里有时候也能热到39度.