Hit the books 开始学习
Meaning: to study
意义：学习
Example: I cant go out this weekend, I have to hit the books because an exam is coming up.
这个周末我不可以出去，由于考试就要来了，我不能不看书。
Piece of cake 小菜一碟
Meaning: something easy
意思是：简单的事情
Example: This test was a piece of cake. I didnt have to study so much!
这次考试是小菜一碟，我用不着学那样多！
Pitch in 努力投入
Meaning: contribute, help out 意思：贡献，帮助
Example: Although Mary was in our group she didnt pitch in with the project.
虽然玛丽在大家组，但她没参与这个项目。
Ring a bell 听起来熟知
Meaning: sound familiar
意思：听起来很了解
Example: Ben didnt cover all the material for the exam. Most questions didnt ring a bell for him.
本没看完所有些考试材料，大部分问题他都不熟知。
Skip class 逃课
Meaning: not go to class
意思是：不去上课
Example: Lee had to go to the doctors this morning so he skipped class.
李今天早上不能不去看大夫，所以他逃课了。
Teachers pet 宠儿
Meaning: a student who is favored by the teacher
意思是：受老师溺爱的学生
Paul is the teachers pet as he always polishes the apple.
保罗是老师面前的红人儿，由于他一直拍老师的马屁。
To be under the weather 身体不舒服
Meaning: to fill ill
含义：生病
Example: Im under the weather. I think Ill skip class.
我不舒服，我想我不可以去上课了。
With flying colours 出色完成
Meaning: with distinction, successfully
意义：独一无二，成功
Example: I passed my final exam with flying colours.
我以优秀的成绩通过了期末考试。
