Powering

Davis Aerobics Center for Good Health.

Davis有氧运动健身中心。

Know something of everything and everything of something.

既要有一般常识，又要有专业知识。

When a student recently saw two workmen using a pneumatic drill outside his university, he immediately telephoned the police and informed them that two students dressed up as workmen were tearing up the road with a pneumatic drill.

最近有个学生看见两个工人在学校门外用风钻干活，马上打电话报告警察，说有两个学生装扮成工人，正在用风钻破坏路面。