seven
['sevn]
num.七
例句与用法：
Four multiplied by seven is twenty-eight.
7乘4等于28。
I have seven roommates in my university.
上大学时，我有七个室友。
He was composing at the piano at the age of seven.
他7岁时就会钢琴作曲。
Some insects produce seven or eight broods a year.
有些昆虫一年产七八次卵。
There are seven continents in the world.
世界上有七大洲。
Put two noughts after a seven to make seven hundred.
在7后面加两个零成为700。
Two plus five is seven.
二加五等于七。
Everything is at sixes and sevens in the house.
家里现在乱七八糟。
详细释义：
a.
七的; 七个的
n.
七; 七个