adj.第十七的,十七分之一的
I was the seventh child in a family of 11.
我在家里的11个孩子中排行老七。
A million people died, a seventh of the population.
共有100万人丧生,占总人口的七分之一。
After I was given my first camera I was in seventh heaven.
我得到我的第一台照相机后开心极了。