.For every hour they skate?

问题描述:

.For every hour they skate?
For every hour they skate,each student raises ten yuan for charity.
这里的for起什么作用?翻译成什么?

每滑雪一小时,每个学生都将为慈善事业捐助10元.
此处的for,应该解释为:就……而言