What this means, if you average it out, is that since children start learning their first words at about their first year of life, they learn about nine new words a day.

如果你将这个数字平均一下,这意味着,儿童从一岁左右,学习第一个词开始,每天学会九个新词

耶鲁公开课 - 心理学导论课程节选

which you'll think, only a ten or eleven year old, but when there is thirteen of them, it's a lot.

你会想，不就是十岁、十一岁的小孩嘛，但有十三个还是很多的。

大城市是否危险？ - SpeakingMax英语口语达人

I did have a friend who was beat up by about twelve or thirteen kids who were all between ten and eleven years old,

我有个朋友曾被十二三个孩子殴打，都在十岁和十一岁之间。

大城市是否危险？ - SpeakingMax英语口语达人

And for girls, they go to a prep school between the age of 4 and 11.

对于女孩，她们在四岁和十一岁之间去预科学校。

英国的教育 - SpeakingMax英语口语达人

And then when you are 11, you would move on to a secondary school.

然后十一岁的时候，继续上中学。

英国的教育 - SpeakingMax英语口语达人