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1·My daughter is nine years old.

我的女儿九岁了。

2·I was only nine years old at that time.

我那时候只有九岁。

3·I started playing when I was nine years old, and football got me through difficult periods.

我从九岁开始踢球，足球帮助我度过了困难时期。

4·I've been skiing since I was eight or nine years old.

我从八九岁就开始滑雪了。

5·The story began in 2013 when Campbell was nine years old.

故事开始于2013年，当时坎贝尔9岁。

6·Mo Yan is fifty nine years old in 2015, and his real name is Guan Moyue.

莫言在2015年59岁，真名为管谟月。

7·For example, my sister's birthday is December 9th and her golden birthday would have been the year she turned nine years old.

例如，我姐姐的生日是12月9日，她的黄金生日本应是她满9岁的那一年的生日。

8·So, for example, my sister's birthday is December 9th and her golden birthday would have been the year she turned nine years old.

例如，我姐姐的生日是12月9日，她最好的生日是她满9岁的那一年。

9·Memory: nine years old.

回忆：九岁那年。

10·And now, Joe, I am seventy-nine years old.

而现在，乔，我79岁了。