2--I beg your pardon?!

1--Why is a 90% a B?

2--I'm trying to challenge you guys.

1--That's not a challenge, that's a punishment.

2--I've had this policy since I started teaching.

1--It's time for a change.

2--I'm not changing my policy because you don't like it.

1--Put yourself in my shoes.

2--I have been a student once, and I think my policy is fair.

1--I'm going to drop your class!

2--Go ahead! Less for me to grade!

===================================
注解：

1.pardon原谅
2.challenge挑战   
3.policy政策

===================================
译文：

1--我认为你的评分政策是不公平的。

2--你说什么？

1--为什么90分只能得B。

2--我想给你们一些挑战。

1--那不是挑战，那是惩罚。

2--从我开始教学我就用这套评分政策。

1--是时候改变了。

2--我不会因为你们不喜欢它而改变我的评分政策。

1--设身处地的想想。

2--我曾经是学生，而且我 认为我的政策是公平的。

1--我将要逃掉你的课！

2--随便！我的分数又不会少！