You are buying direct, rather than through an agent.
你在直接购买，而不是通过代理商购买。
He needed a sounding board rather than thinking alone.
他需要一个参谋，而不是独自思考。
It's healthier to snack on fruit rather than chocolate.
作为点心，水果比巧克力更有益于健康。
The problem was psychological rather than physiological.
这是个心理而不是生理问题。