1. No sweat 不麻烦，没问题
No sweat. I'll have the report done for you in an hour.
没问题，我会在一小时之内为你做出这份报告。
释义：直译是不流汗水，引申为没事、没问题。
2. No wonder 怪不得，难怪
No wonder Sam was appointed president of the Student Body - his father was the principal of the school.
怪不得山姆被任命为学生会主席，原来他爸爸是校长。
释义：
wonder: 奇迹
no wonder: 没有奇迹，预料之中