In comparison, only thirteen percent of the monkeys on restricted diets had died.

VOA: special.2009.09.01

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

Thirteen won gold medals. Britain,which will host the Summer Olympics in London in 2012, won only one medal, a gold by Amy Williams in women's skeleton.

VOA: standard.2010.03.01