Did you ever think of photographing an aerobics class?
你想过拍摄有氧运动课吗?
I asked him to paint it for me, but he wouldn't
我请他帮我油漆,但是他不肯。
The administrative overheads of a business are low to the extent that everyone working in the business can be trusted to behave in a way that best promotes the interests of the firm.