Don't waste your breath trying to persuade them, they'll never listen.
别白费口舌规劝他们,他们不会听你的话。
By the way,who are you waiting for?
顺便说,你正在等谁?
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.