New Words：

mean [mi:n]
v.意味着；意思是；打算
n.平均值；平均数
adj.刻薄；吝啬的；小气的；不善良

Sample Sentences：

The mean of 7,9 and 14 is 10.
He's too mean to buy us a meal.
I'm sorry I hurt you,I didn't mean to.
They didn't mean to go and help you.
I don't understand what the word means.