spend後面加介詞on或in,spend中文意思是v. 度過,花(時間)花(錢),花費消耗,用盡(精力等)
I spend at least six hours a week in marking.我每週至少要花六個小時批改作業。
They spend hours feeding on the ocean floor.它們花幾個小時在海底進食。
Why can't you spend a few bucks on a coat?